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1.B
2.E 解释为什么只有smaller animals remains in the cave,每个选项从不同维度解释为啥没有大型动物,没有看出选项间程度的区分,选了E,早期也有large animals remains,只是被早期探险家remove了。
RC:
benefits of monogamy remains debatable
why monogamy in primates -- trade off between 2 factors
conflicting finding in another study: resource distribution and female population density contributed to monogamy in mammals
humans monogamy: natural causes remain ?
BAAB CDDD
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