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."
【C1】
选项
答案B
解析 空格前为a(n)，而空格后为名词boost，因此空格应填入形容词修饰boost。上一句提到“和母亲一起生活的男人可能很难找到红粉佳人共度情人节”，而本句的But则表明，经常待在母亲身边的公猴在交配季节似乎能得到一些额外的优势，因此词库中的added“额外的”最合适。
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