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Scientists have dated sharp-edged flakes of stone found in

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Scientists have dated sharp-edged flakes of stone found in [#permalink] New post 28 Aug 2010, 13:39
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

62% (01:50) correct 38% (00:55) wrong based on 89 sessions
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
[Reveal] Spoiler: OA
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Re: Scientists have dated sharp-edged flakes of stone found [#permalink] New post 28 Aug 2010, 22:16
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
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Re: Scientists have dated sharp-edged flakes of stone found [#permalink] New post 29 Aug 2010, 15:56
Please underline the question. It's really difficult to understand the question without underline!.

Thank you.
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Re: Scientists have dated sharp-edged flakes of stone found [#permalink] New post 29 Aug 2010, 16:06
please underline the sentences.
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Re: Scientists have dated sharp-edged flakes of stone found [#permalink] New post 29 Aug 2010, 16:19
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.
Re: Scientists have dated sharp-edged flakes of stone found   [#permalink] 29 Aug 2010, 16:19
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