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GWD27-Q35

In polluted environments, dolphinsgradually accumulated toxins in their body fat, and the larger the dolphin, themore accumulated toxin it can tolerate. Nearly 80 percent of the toxins a female dolphin has accumulated passinto the fat-rich milk her nursing calf ingests.  Therefore, the unusually high mortality rateamong dolphin calves in the industrially contaminated waters along Florida’s Gulf




Coast is probably theresult of their being poisoned by their mother’s milk.

Which of the following, if true, moststrengthens the argument?




A.   The survival rate of firstborn dolphincalves in the area along Florida’s Gulf




Coastis highest for those whose mothers were killed before they were weaned.

B.   The rate at which adult dolphins living inthe waters along Florida’s Gulf




Coastaccumulate toxins is no higher than that of adult dolphins in comparablypolluted waters elsewhere.

C.   Among dolphin calves born in the area along Florida’s Gulf




Coast, the mortality rateis highest among those with living siblings.

D.   As dolphins age, they accumulate toxins fromthe environment more slowly than when they were young.




E.    Dolphins, like other marine mammals, have ahigher proportion of body fat than do most land mammals.




答案选A,我个人在A和D之间徘徊。为什么D会错?海豚随着成长积累T的速度减少,不正说明小时候的积累是由于喝奶吗?


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A提到wean断奶,是一个关键词,无因无果。D的话,没跟母乳扯上关系吧

TOP

遇到削弱和加强题时,立刻想到条件和结果的因果关系。因此,答案就是要找到其他的条件能够和结果构成因果关系。

此题中,条件是---(因为)母乳有毒, 结果是---婴儿死亡率高;
A是说,条件---(因为)没吃到母乳,结果是---婴儿存活率高
这就是加强。

如果要削弱,就要找到其他影响结果的条件,比如很多人渔船错误的打捞,造成婴儿海豚被错误钓起致死。

你要找到最有关的条件,而D与母乳问题无关,“驴唇不对马嘴“。

TOP

好的,明白啦~谢谢

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