我前天考试，竟然做到了一个PREP07的原题.。 = =。。

ddcczzppgod

The prairie vole, a small NorthAmerican grassland rodent, breeds year-round, and a group of voles livingtogether consists primarily of an extended family, often including two or morelitters.  Voles commonly live in largegroups from late autumn through winter; from spring through early autumn,however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortalityamong young voles.

Which of the following, if true,provides the strongest support for the explanation offered?

(A) It is in the spring and earlysummer that prairie vole communities generally contain the highest proportionof young voles.

(B) Prairie vole populations varydramatically in size from year to year.

(C) The prairie vole subsistsprimarily on broad-leaved plants that are abundant only in spring.

(D) Winters in the prairie voles'habitat are often harsh, with temperatures that drop well below freezing.

(E) Snakes, a major predator ofyoung prairie voles, are active only from spring through early autumn.

= =。。一模一样答案是E

HermanLu

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