prep 破解版-P1-3

peter3008

3. (24275-!-item-!-188;#058&000768)
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. 结论
支持就是支持结论/说明措施可行或者措施达目的
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. 无关比较
(B) Prairie vole populations vary dramatically in size from year to year. 无关
(C) The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring. 无关
(D) Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing. 完全无关内容
(E) Snakes, a major predator of young prairie voles, are active only from spring through early autumn. 他因加强, 季节也和原文对应, 正好说明了为什么这个时节野鼠数量少.
大草原的野鼠, 一种北美牧地的动物, 每年一轮的繁殖, 住在一起阔大家庭, 经常包括2窝以上. 野鼠经常从晚秋开始到冬天一大群的住在一起; 但是从春天到早秋, 大多数的野鼠小数目的在一起. group size的季节性变化可能是因为小野鼠死亡率的季节变化.

[此贴子已经被作者于2007-7-15 5:52:09编辑过]

-- by 会员 MissNewMe (2007/7/15 5:51:00)

CD２个选项既可以理解为无关也可以理解为削弱,结论说了The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles,同时文中的fact也告诉你winter数量多(即是小老鼠死亡好,可以那么去理解),　spring to autumn数量少.　ＣＤ如果按照一般的常识来解题,也是winter数量少因为环境恶劣, spring数量多,autumn不知道数量,选项没说,明显的是与文中结论和fact相矛盾的.其实一开始可以打个问号,等所有选项看完,很自然的就排除了

Politician

呵呵。其实D选项完全冲撞原文了，原文意思是WINTER环境下数量更多。都看看清楚吧。

liktenstain

楼主不要用背景知识。