GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 22 Jun 2018, 19:38

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Scientists have dated sharp-edged flakes of stone found in

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

1 KUDOS received
Director
Director
avatar
Joined: 10 Feb 2006
Posts: 650
Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post Updated on: 23 Oct 2017, 05:47
1
11
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

64% (00:42) correct 36% (00:57) wrong based on 1035 sessions

HideShow timer Statistics

Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.

(A) when it is known that humans made

(B) at which it is known that humans had made

(C) at which humans are known to have made

(D) that humans are known to be making

(E) of humans who were known to make

_________________

GMAT the final frontie!!!.


Originally posted by alimad on 03 Sep 2007, 20:47.
Last edited by hazelnut on 23 Oct 2017, 05:47, edited 2 times in total.
Edited the question.
Director
Director
avatar
Joined: 22 Aug 2007
Posts: 552
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 04 Sep 2007, 01:33
1
alimad wrote:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.

A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]

I would think the answer should be E. ??


C,

.........date at which something is known to .....is correct idiom
f.e: date at which the portrait is known to have been sold...

E is unidiomatic, completely.

we can say date of event {birth, death...test} f,e: we can say date of his {her, Ann`s} birth, but 'date of ' is not used directly with people or living things.
1 KUDOS received
Manager
Manager
avatar
Joined: 11 Jul 2009
Posts: 50
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 18 Nov 2009, 19:58
1
alimad wrote:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.

A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]

I would think the answer should be E. ??


A wrong tense.. Have dated so have made should be used instead of had made.. Also it seems to refer to scientists
B Had made suggested that it is not being done any more.Also it seems to refer to scientists
C correct --have dated and have made llel and earliest date at which - idiomatically correct
D to be making wrong tense and idiom
E humans who were known - changes meaning and also wrong tense
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Affiliations: PMP
Joined: 13 Oct 2009
Posts: 271
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 01 Dec 2009, 08:53
1
Dated at or Date at is correct idiom , so A,D, E are out

in B, "it" is ambiguous;
C looks better

hence C
_________________

Thanks, Sri
-------------------------------
keep uppp...ing the tempo...

Press +1 Kudos, if you think my post gave u a tiny tip

Senior Manager
Senior Manager
User avatar
Joined: 28 Jun 2009
Posts: 414
Location: United States (MA)
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 28 Aug 2010, 23:16
C is correct.

Given : Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million
years ago, pushing back by more than 150,000 years the earliest date when it is
known that humans made
stone tools.

I simplified the sentence to:

Scientists have dated tool2 to between x and y yrs ago, pushing back z yrs the date when it is known that humans made tools.

A. when it is known that humans made - un-referenced pronoun "it" - wrong
B. at which it is known that humans had made - wrong
C. at which humans are known to have made - Correct
D. that humans are known to be making - wrong
E. of humans who were known to make - wrong
Manager
Manager
avatar
Joined: 09 Jun 2010
Posts: 107
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 29 Aug 2010, 00:27
2
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments
of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million
years ago, pushing back by more than 150,000 years the earliest date when it is
known that humans made
stone tools.

A. when it is known that humans made

B. at which it is known that humans had made

C. at which humans are known to have made

D. that humans are known to be making

E. of humans who were known to make

Subject is date => at which is correct. Either B or C
It is known that is unidiomatic.
Correct option C.
Senior Manager
Senior Manager
User avatar
Joined: 28 Jun 2009
Posts: 414
Location: United States (MA)
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 29 Aug 2010, 17:19
kissthegmat wrote:
Please underline the question. It's really difficult to understand the question without underline!.

Thank you.


The answer option A is always the underlined part from the given sentence. I don't think its necessary to underline it.
Manager
Manager
avatar
Joined: 12 Nov 2011
Posts: 91
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 28 Jan 2012, 11:13
Could someone please explaine "Have made" in C?
Manager
Manager
avatar
Joined: 23 Oct 2011
Posts: 50
Location: Ukraine
Schools: LBS '14 (M)
GMAT 1: 650 Q44 V35
WE: Corporate Finance (Mutual Funds and Brokerage)
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 06 May 2012, 13:51
Runner2 wrote:
Could someone please explaine "Have made" in C?


I have the same question.
as per previous discussions, "have made" is || with "have dated". I think it is wrong because "have dated" referes to scientists and current time, but "have made" to people who lived thousand of years ago.

why is present perfect used?
Manager
Manager
avatar
Joined: 19 Oct 2011
Posts: 117
Location: India
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 07 May 2012, 18:36
1
alimad wrote:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.


[/u]

I would think the answer should be E. ??



A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make : speaks about time not humans.
_________________

Encourage me by pressing the KUDOS if you find my post to be helpful.



Help me win "The One Thing You Wish You Knew - GMAT Club Contest"
http://gmatclub.com/forum/the-one-thing-you-wish-you-knew-gmat-club-contest-140358.html#p1130989

Senior Manager
Senior Manager
User avatar
Affiliations: UWC
Joined: 09 May 2012
Posts: 385
Location: Canada
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Reviews Badge
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 11 May 2012, 10:42
Code:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date [u]when it is known that humans
made[/u] stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make


OA:C
Background: Scientists have dated sediments. They found that the pieces of sharped-edged flakes were much older than samples previously found. This sentence structure has two parts that need to be parallel. The scientists have dated and the knowledge of the earliest date at which humans are to have made...

A: ...that humans made is not parallel to Scientists have dated INCORRECT
B: had made is also not parallel; so can be eliminated INCORRECT
C: at which humans are known to have made IS parallel to Scientists have dated CORRECT
D: to be making...not parallel INCORRECT
E: to make is not parallel because it is not in the PRESENT PERFECT tense INCORRECT

hope this helps guys....
Senior Manager
Senior Manager
User avatar
Affiliations: UWC
Joined: 09 May 2012
Posts: 385
Location: Canada
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Reviews Badge
Re: Scientists have dated sharp-edged flakes of stone found in the fine-gr [#permalink]

Show Tags

New post 11 May 2012, 10:56
Quote:
as per previous discussions, "have made" is || with "have dated". I think it is wrong because "have dated" referes to scientists and current time, but "have made" to people who lived thousand of years ago.


have made does not refer to to the people who lived thousands of years ago; however, it is modifying the earliest known date that is currently known (i.e the current theory, that these type of tools were only made 150,000 later)

Does this make sense?
Manager
Manager
User avatar
Joined: 28 Jul 2011
Posts: 208
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 04 Dec 2012, 05:29
I was not able to decide between A & C.

Can any1 explain the though process behind answering this question?


Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments
of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million
years ago,
Subject: Scientists
Verb: have dated

pushing back by more than 150,000 years the earliest date when it is
known that humans made stone tools.
Subject: the earliest date
Verb: is

that humans made stone tools
Subject: humans
Verb: made
Expert Post
24 KUDOS received
Magoosh GMAT Instructor
User avatar
G
Joined: 28 Dec 2011
Posts: 4668
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 04 Dec 2012, 11:59
24
5
kuttingchai wrote:
I was not able to decide between A & C.
Can any1 explain the though process behind answering this question?

I'm happy to help with this. :-)

Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make


The funny thing here is that (A) is more or less grammatically correct, but illogical. This is what is so tricky about GMAT SC --- it's not enough to be analyzing at the level of grammar. We have to take logic into account.

What the sentence is trying to say ----- (a) humans made tools 2.6 Mya, and (b) right now, we know this to be the case. There are two actions, happening at different times --- the tool making (2.6 Mya) and the knowing about the tool-making (right now).

Look at thhe grammatical structure in (A).
.... the earliest date when it is known that humans made stone tools.
What precisely is happening at that "when"-time? Is it the knowing or the making? Technically, the clause that immediately follows "when" is "it is known", so grammatically, this would suggest the knowing happened at this "when"-time, 2.6 Mya. But logically, we know that's not the case --- it's not the "knowing" that happened 2.6 Mya, but rather the tool-making. The knowing is what the paleoanthropologists are doing right now.

That's why (A) is wrong and (C) is right.

Does all this make sense?

Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Manager
Manager
User avatar
Joined: 28 Jul 2011
Posts: 208
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 04 Dec 2012, 22:58
mikemcgarry wrote:
kuttingchai wrote:
I was not able to decide between A & C.
Can any1 explain the though process behind answering this question?

I'm happy to help with this. :-)

Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make


The funny thing here is that (A) is more or less grammatically correct, but illogical. This is what is so tricky about GMAT SC --- it's not enough to be analyzing at the level of grammar. We have to take logic into account.

What the sentence is trying to say ----- (a) humans made tools 2.6 Mya, and (b) right now, we know this to be the case. There are two actions, happening at different times --- the tool making (2.6 Mya) and the knowing about the tool-making (right now).

Look at thhe grammatical structure in (A).
.... the earliest date when it is known that humans made stone tools.
What precisely is happening at that "when"-time? Is it the knowing or the making? Technically, the clause that immediately follows "when" is "it is known", so grammatically, this would suggest the knowing happened at this "when"-time, 2.6 Mya. But logically, we know that's not the case --- it's not the "knowing" that happened 2.6 Mya, but rather the tool-making. The knowing is what the paleoanthropologists are doing right now.

That's why (A) is wrong and (C) is right.

Does all this make sense?

Mike :-)


Thank you Mike, that helped. I got that the "knowing" part is down right now.

Just one confusion

Do we have 2 independent clauses here?

Independent clause 1
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,

Independent clause 2
pushing back by more than 150,000 years the earliest date when it is known [that humans made stone tools.]
Expert Post
1 KUDOS received
Magoosh GMAT Instructor
User avatar
G
Joined: 28 Dec 2011
Posts: 4668
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 05 Dec 2012, 11:44
1
kuttingchai wrote:
Do we have 2 independent clauses here?

Independent clause 1
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,

Independent clause 2
pushing back by more than 150,000 years the earliest date when it is known (that humans made stone tools.)

Good question. No, there is only one independent clause, the first. A clause must have a bonafide subject and a bonafide verb --- this clause has the subject "scientists" and the verb "have dated."

The second, "pushing back by more than 150,000 years the earliest date ..." is a participial phrase. It has NO subject, and instead of a full verb (e.g. "pushes", "is pushing"), it just has a participle. See this blog: http://magoosh.com/gmat/2012/participle ... -the-gmat/.

What is a bit suspect about this sentence ---- ordinarily a participle would modify a noun, the noun it touches (the "Modifier Touch Rule"). Here, the participle modifies the action of the entire preceding phrase: this is a form that the GMAT SC tends to avoid. The question at the top is not attributed to a source. I would be suspicious of whatever source produced this question. There are so many bad sources of GMAT SC questions out there, and I think this may be from one of them.

Does all this make sense?

Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Manager
Manager
avatar
Joined: 28 Feb 2012
Posts: 112
Concentration: Strategy, International Business
Schools: INSEAD Jan '13
GPA: 3.9
WE: Marketing (Other)
GMAT ToolKit User
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 06 Dec 2012, 22:41
mikemcgarry wrote:
kuttingchai wrote:
I was not able to decide between A & C.
Can any1 explain the though process behind answering this question?

I'm happy to help with this. :-)

Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make


The funny thing here is that (A) is more or less grammatically correct, but illogical. This is what is so tricky about GMAT SC --- it's not enough to be analyzing at the level of grammar. We have to take logic into account.

What the sentence is trying to say ----- (a) humans made tools 2.6 Mya, and (b) right now, we know this to be the case. There are two actions, happening at different times --- the tool making (2.6 Mya) and the knowing about the tool-making (right now).

Look at thhe grammatical structure in (A).
.... the earliest date when it is known that humans made stone tools.
What precisely is happening at that "when"-time? Is it the knowing or the making? Technically, the clause that immediately follows "when" is "it is known", so grammatically, this would suggest the knowing happened at this "when"-time, 2.6 Mya. But logically, we know that's not the case --- it's not the "knowing" that happened 2.6 Mya, but rather the tool-making. The knowing is what the paleoanthropologists are doing right now.

That's why (A) is wrong and (C) is right.

Does all this make sense?

Mike :-)


Thanks Mike for good explanation. I have chosen B, and think it is gramatically correct, but again here as you have explained "it is known" refers to the time when we find out about it but not humans first tool making time. Am i correct or i missed anything?
_________________

If you found my post useful and/or interesting - you are welcome to give kudos!

Expert Post
2 KUDOS received
Magoosh GMAT Instructor
User avatar
G
Joined: 28 Dec 2011
Posts: 4668
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 07 Dec 2012, 11:19
2
2
ziko wrote:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make

Thanks Mike for good explanation. I have chosen B, and think it is grammatically correct, but again here as you have explained "it is known" refers to the time when we find out about it but not humans first tool making time. Am i correct or i missed anything?

Dear Ziko,
First of all, yes, there's the logic issue --- the "earliest date" --- does this refer to the earliest date of knowing or the earliest day of making stone tools. Like (A), (B) also doesn't resolve this ambiguity.
Furthermore, (B) using something called the "empty it" ---- the "it" in "it is know that humans had made stone tools" is a pronoun that doesn't refer to any antecedent. It doesn't refer to anything. It is purely a grammatical placeholder, and in that sense it is "empty" --- unlike most bonafide pronouns, this "it" refers to nothing --- it has no valid antecedent. The GMAT generally avoids the "empty it" --- once or twice, I have seen an OA on official material involving an "empty it", but the GMAT uses the "empty it" far more frequently to construct wordy indirect phrases for incorrect answer choices.

Consider these two sentences:
(1) It is known that early humans used stone tools.
(2) Early humans are know to have used stone tools.
Both are grammatically correct, but the GMAT would consider the second one more direct, more powerful, and therefore a much better answer than the first.
Be suspicious of the "empty it" wherever you see it --- even if it's grammatically correct, it is in all likelihood not the correct answer.

Does all this make?

Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Manager
Manager
avatar
Joined: 28 Feb 2012
Posts: 112
Concentration: Strategy, International Business
Schools: INSEAD Jan '13
GPA: 3.9
WE: Marketing (Other)
GMAT ToolKit User
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 09 Dec 2012, 00:32
mikemcgarry wrote:
ziko wrote:
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make

Thanks Mike for good explanation. I have chosen B, and think it is grammatically correct, but again here as you have explained "it is known" refers to the time when we find out about it but not humans first tool making time. Am i correct or i missed anything?

Dear Ziko,
First of all, yes, there's the logic issue --- the "earliest date" --- does this refer to the earliest date of knowing or the earliest day of making stone tools. Like (A), (B) also doesn't resolve this ambiguity.
Furthermore, (B) using something called the "empty it" ---- the "it" in "it is know that humans had made stone tools" is a pronoun that doesn't refer to any antecedent. It doesn't refer to anything. It is purely a grammatical placeholder, and in that sense it is "empty" --- unlike most bonafide pronouns, this "it" refers to nothing --- it has no valid antecedent. The GMAT generally avoids the "empty it" --- once or twice, I have seen an OA on official material involving an "empty it", but the GMAT uses the "empty it" far more frequently to construct wordy indirect phrases for incorrect answer choices.

Consider these two sentences:
(1) It is known that early humans used stone tools.
(2) Early humans are know to have used stone tools.
Both are grammatically correct, but the GMAT would consider the second one more direct, more powerful, and therefore a much better answer than the first.
Be suspicious of the "empty it" wherever you see it --- even if it's grammatically correct, it is in all likelihood not the correct answer.

Does all this make?

Mike :-)


Thanks Mike,
Your answer is very good. But does it mean that i alsways should avoid "emty it"? (of course whenever i am faced to two gramatically and logically correct answers).
_________________

If you found my post useful and/or interesting - you are welcome to give kudos!

Expert Post
Magoosh GMAT Instructor
User avatar
G
Joined: 28 Dec 2011
Posts: 4668
Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]

Show Tags

New post 09 Dec 2012, 15:10
ziko wrote:
Thanks Mike,
Your answer is very good. But does it mean that i always should avoid "empty it"? (of course whenever i am faced to two grammatically and logically correct answers).

Don't mechanically avoid the "empty it" --- nothing in grammar is completely mechanical. Most often, you will notice that the "empty it" phrasing is longer, wordier, less clear, less concise, less powerful. Most often, if two ways to say something are grammatically correct and one involves the "empty it", then then other will be more concise and more powerful. There are rare cases in which the most direct and efficient way to express something involves the "empty it." There are also GMAT SC problems in which four of the answers are incorrect, and the only possible correct answer involves an "empty it" --- remember, the answer to a GMAT SC question is going to be the best answer from among those five, not necessarily the very best way to express that idea. It will be grammatically correct, but not necessarily ideal.
Does all this make sense?
Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Re: Scientists have dated sharp-edged flakes of stone found in   [#permalink] 09 Dec 2012, 15:10

Go to page    1   2    Next  [ 34 posts ] 

Display posts from previous: Sort by

Scientists have dated sharp-edged flakes of stone found in

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.