prep2007CR1详解（3M修改版）.doc

1、Practice Test #1 Critical Reasoning (72 Questions)1. (24179-!-item-!-188;#058#058#058 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.Voles秋冬季的家庭规模大

2、，春秋季家庭规模要小，原因是幼鼠季节性的死亡文章推理：幼鼠季节性死亡导致春秋家庭规模小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.文章讨论幼鼠的数量和家庭规模的关系，和幼鼠的百分比无关，说东道西(B) Pr

3、airie vole populations vary dramatically in size from year to year.只是简单重复前提，和幼鼠无关，重复前提(C) The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring.加强无效，首先和幼鼠死亡无关，并且只说春季没有提到秋季。无关他因(D) Winters in the prairie voles habitat are often harsh, with temperatures that drop

4、well below freezing.说东道西，结论要推幼鼠死亡和春秋季家庭规模的关系，和冬季无关，也属于偷换集合(E) Snakes, a major predator of young prairie voles, are active only from spring through early autumn.正确，他因直接加强结论4. (24323-!-item-!-188;#058 many dolphins get as much as half of their food each day there. Although dolphins that first benefit

5、from the program as adults are healthy and long-lived, their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild.背景环境是海滩上有喂养海豚项目。结果，成年海豚健康长寿但是小海豚寿命比野生喂养短Which of the following, if true, most helps to explain the lower life expectancy of offspring of do

6、lphins feeding at the beach compared to other young dolphins?(A) Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate.in many other areas of the open seas并没有把海滩独立出来，并且鲨鱼应该会对成年海豚也有影响。不能解释矛盾，并且文章并没有标明feed exclus

7、ively in the wild.就是open seas off the beach，属于无关比较(B) Many of the adult dolphins that feed at the beach are females that nurse their offspring there.并不能说明小海豚死亡率高，也没有进行核野外的比较，说东道西(C) The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.无差别更应

8、该相同，架桥错误(D) Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.和一个月几次没有关系，没有进行比较，说东道西(E) Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.正确，解释了成年海豚和小海豚之间的一

9、个关系，并且和野外联系在一起5. (24371-!-item-!-188;#058#058#058#058#058#058#058#058#058#058#058 the second is part of that explanation.(B) The first acknowledges a consideration that weighs against the conclusion of the argument; the second is that conclusion.(C) The first acknowledges a consideration that weighs

10、 against the conclusion of the argument; the second provides evidence in support of that conclusion.(D) The first provides evidence in support of the conclusion of the argument; the second acknowledges a consideration that weighs against that conclusion.(E) The first is a judgment advanced in suppor

11、t of the conclusion of the argument; the second is that conclusion.16. (27621-!-item-!-188;#058#058#058&003330)Many small roads do not have painted markings along their edges. Clear edge markings would make it easier for drivers to see upcoming curves and to judge the cars position on the road, particularly when visibility is poor, and would therefore seem to be a useful contribution to road safety. However, after Greatwater County painted edge markings on all its narrow, winding