2. 外语
  3. A. prime B. added C. by D. reproductive E. excessive F. take G. extends H. produc

A. prime B. added C. by D. reproductive E. excessive F. take G. extends H. produc

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问题     A. prime        B. added        C. by          D. reproductive        E. excessive
    F. take         G. extends      H. producing   I. adult               J. proves
    K. on average   L. early        M. females     N. balance             O. helping
    Human males living with their moms may not expect to have much luck hooking up this Valentine’s Day. But among the northern Muriqui monkeys, males that spend the most time around their mothers seem to get a(n)【C1】________ boost when mating time rolls around.
    The findings, published in the Proceedings of the National Academy of Sciences USA, suggest that females in some species may have evolved to play a critical role in their sons’【C2】________ success. Karen Strier, the paper’s lead author and a professor at the University of Wisconsin-Madison, says the paper "【C3】________ " the so-called grandmother hypothesis, a concept in which human females evolved to live past their【C4】________ reproductive years to spend more time【C5】________ offspring.
    The research team observed and collected genetic data from a group of 67 wild monkeys living in a protected reserve in Brazil’s Atlantic Forest: infants, mothers and possible fathers. They found that six out of the thirteen【C6】________ males they studied spent more time around their mothers than would be expected by chance. These same six monkeys,【C7】________. reproduced the greatest number of offspring.
    The investigators are still trying to figure out why. "It’s not like we see moms intervening and helping their sons out," Strier says. "Maybe【C8】________ sitting near their moms, they get to see when females are sexually active, or maybe they just get more familiar with other【C9】________."
    The findings can help with future conservation efforts for the critically threatened animals. Strier says, "the last thing we would want to do is【C10】________ a male out of the group where it was born."
【C4】
选项
答案A
解析 此处需要填入修饰reproductive years(生育期)的形容词。生育期有很多年，而此处要表达女性在生育期之后花时间在后代上，“花更多时间在在后代上”说明度过了生育的黄金时期，词库中的prime指“黄金时期的”合乎逻辑。early“早期的”也可以跟“生育期”搭配，但并无原文依据，故排除。
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