求助：T-9-20

莫里亚提 · 发表于 2011-5-18 22:50:45

T-9-20:GWD-13-34:
Which of the following, if true, would most weaken the author’s conclusion in lines 25-30?

A.New research reveals that the number of species of birds and parasites that prey on lepidoptera has dropped significantly in recent years.
B.New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles.
C.Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera.
D.Differences among the habitats of lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles.
E.Viral disease is typically observed in a large proportion of the lepidoptera population.

答案为什么是B, D哪里错了？

莫里亚提 · 发表于 2011-5-19 22:46:05

up up ~

莫里亚提 · 发表于 2011-5-20 11:11:32

B中cycle只是shorten了啊？
有木有人解答一下？？

5453 · 发表于 2012-10-11 17:33:40

http://forum.chasedream.com/GMAT_RC/thread-70665-1-1.html

求助：T-9-20

所属分类: GMAT考试

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