Question

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The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups 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 mortality among young voles.

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

(A) It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles.
(B) Prairie vole populations vary dramatically in size from year to year.
(C) The prairie vole subsists primarily 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 of young prairie voles, are active only from spring through early autumn.

Answer 1

在草原田鼠，一个小的北美草原啮齿动物，品种，和一群田鼠住在一起，主要由一个大家庭，往往包括2个或更多的垃圾。田鼠通常住在大群体秋末越冬；从春天到秋天，然而，大多数田鼠住在小团体。季节性变异组大小或许可以解释的季节变化死亡率之间的年轻田鼠。
以下哪项，如果属实，提供最强大的支持，提供的解释？
（一）它是在春季和初夏，草原田鼠的社区通常含有比例最高的年轻田鼠。
（二）草原田鼠种群差异显着的规模每年。
（三）草原田鼠的存在主要是阔叶植物丰富，只有在春天。
（四）冬季在草原田鼠的栖息地往往是苛刻的，温度下降低于冻结。
（五）蛇，主要捕食小草原田鼠，是积极的只有从春天到秋天。