单选题
Which of the following inferences CANNOT be made from the information in paragraph one?
A、
Calhoun' s experiment is still considered important today.
B、
Overpopulation causes pathological behavior in rat populations.
C、
Stress does not occur in rat communities unless there is overcrowding.
D、
Calhoun had experimented with rats before.
【正确答案】
A
【答案解析】
[试题分析] 本题考查考生通过文章内容作推断的能力。
[详细解答] B、C及D项均可在第一段中找到相应的叙述文字，而A项丝毫未曾提及。
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