2. 外语
  3. Human males living with their moms may not expect to have much luck hooking up this Valentine’s Day.(1)_____ among the northern

Human males living with their moms may not expect to have much luck hooking up this Valentine’s Day.(1)_____ among the northern

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问题     Human males living with their moms may not expect to have much luck hooking up this Valentine’s Day.(1)_____ among the northern Muriqui monkeys, males that spend the most time around their mothers seem to get a(n)(2)_____ 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(3)_____ have evolved to play a critical role in their sons’ reproductive (4)_____. Karen Strier, the paper’s lead author and a professor at the University of Wisconsin-Madison, says the paper "(5)_____" the so-called grandmother hypothesis, a concept(6)_____ human females evolved to live past their(7)_____ reproductive years to spend more time(8)_____ offspring.
    The research team observed and(9)_____ 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(10)_____ males they studied spent more time around their mothers (11)_____ would be expected by chance. These same six monkeys, on(12)______, reproduced the greatest number of offspring.
    The investigators are still trying to(13)_____ out why. "It’s not until we see moms intervening and helping their sons out," Strier says. "Maybe (14)_____ sitting near their moms, they get to see when females are(15)_____ active, or maybe they just get more familiar with other(16)_____."
    The findings can(17)_____ with future conservation efforts for the critically(18)_____ animals. Strier says, "the(19)_____ thing we would want to do is(20)_____ a male out of the group where it was born."
(12)
选项 A、average
B、occasion
C、purpose
D、balance
答案A
解析 此处要表达的意思是：更多时间与母亲待在一起的6只公猴，也是繁殖后代最多的6只。onaverage意为“平均来看”，符合句意。on occasion“有时”；on purpose“故意”；on balance“总而言之”，一般指对既定事实的总结。
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