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GRE argument帮忙找一下这题的逻辑错误呀 后天就考了

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GRE argument帮忙找一下这题的逻辑错误呀 后天就考了
A recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation.The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey),firstborn infant monkeys produce up to twice as much of the hormone cortisol,which primes the body for increased activity levels,as do their younger siblings.Firstborn humans also produce relatively high levels of cortisol in stimulating situations (such as the return of a parent after an absence).The study also found that during pregnancy,first-time mother monkeys had higher levels of cortisol than did those who had had several offspring."
18只样本量过小 不具有代表性
没有证据说明cortisol是因为应激而产生的
人类和猴子不见得一样 不能说人类产生cortisol也是为了提高活动水平
first-time mother monkeys不一定是受到了刺激才产生了cortisol 因此这两者不见得有必然关系
不知道对不对 一考完G就整个丢掉了 不过祝考试成功