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Updated on: 26 Sep 2017, 17:34
Originally posted by atalpanditgmat on 08 Apr 2013, 11:16.
Last edited by BillyZ on 26 Sep 2017, 17:34, edited 2 times in total.
Last edited by BillyZ on 26 Sep 2017, 17:34, edited 2 times in total.
Moved the comments under spoiler.
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:22) correct
18%
(01:32)
wrong
based on 2184
sessions
History
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Time
Result
Not Attempted Yet
According to scientists at the University of Alaska, while the surface temperature of the globe has risen over the last century by about one degree Fahrenheit, the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees.
(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees
(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees
(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years
(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees
(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees
(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees
(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years
(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees
Why B is wrong? "Is it The surface temperature in ......." is repeated in the second clause or anything else beyond by observation?
Answers with complete explanation will be appreciated.
OA will be given after discussion...
thanks
Answers with complete explanation will be appreciated.
OA will be given after discussion...
thanks
I wouldn’t think B is wrong.
Let’s go case by case
(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees --- ‘in the previous’ means that the thirty years do not include the present. Then we cannot justify the use of present perfect ‘has increased ’ wrong
(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees ---over the last thirty years means last thirty years including the present. So the use of present perfect ‘has increased ‘ is justified.--- Correct
(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada --- we can’t use past tense, when we say last thirty years. Wrong
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years ---- had increased denotes it happened before some other past event; There is no such simple past event to justify past perfect – wrong
(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees --- can’t use present perfect ‘has increased’ when we say previous
Take away: use past tense when previous is used, because previous is a closed chapter of a past event. Use present perfect when last is use, because last is a roll-over that includes the present.
Let’s go case by case
(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees --- ‘in the previous’ means that the thirty years do not include the present. Then we cannot justify the use of present perfect ‘has increased ’ wrong
(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees ---over the last thirty years means last thirty years including the present. So the use of present perfect ‘has increased ‘ is justified.--- Correct
(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada --- we can’t use past tense, when we say last thirty years. Wrong
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years ---- had increased denotes it happened before some other past event; There is no such simple past event to justify past perfect – wrong
(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees --- can’t use present perfect ‘has increased’ when we say previous
Take away: use past tense when previous is used, because previous is a closed chapter of a past event. Use present perfect when last is use, because last is a roll-over that includes the present.
General Discussion
08 Apr 2013, 11:27
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atalpanditgmat
D and E have "it" which is not clear, what does it refer to? C is misplaced.
Between A and B, in A seems that the temperture has increased each year by 5 degrees, in B seems that has increased by 5 degrees in 30 years. B to me is more clear, are you sure it s wrong?
Hi，
