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--------------------4Women in the hunter-gatherer societies are more likely to give birth to daughters because_____. A.they agree that giving birth to daughters is beneficial in the evolutionary senseB.sons are likely to produce lots of grandchildren with several womenC.they think it is a better practice for a daughter to produce grandchildren with only one mateD.they think bringing sons to term is wasting time and resources 参考答案： D 推理题。文章第五段指出在原始狩猎社会中，健康、强壮的男性可以和几位女性一起繁殖许多后代，而弱小的则会被边缘化甚至在男性竞争中被杀死。妇女在生育孩子时就会面临这样的压力，她更情愿将男婴流产，也不愿意花费了如此多的时间和精力后将男婴生出来，却面临被淘汰的压力。因此，在原始狩猎社会中，女孩出生率较高的原因是因为妇女生育时面临的这种压力。答案中，D为正确答案。A选项显然是错误的，原始人不会以进化的观点去思考问题。B选项的说法只是一个现象，并不是题干的原因。C选项的说法与原文相反。----------------------------------------5From this passage, we may draw a conclusion that_____. A.acute stress is more likely to cause women to choose aborting boys than chronic stressB.stress to a woman at the time of conception, whether acute or chronic, will shift the sex ratio towards girlsC.more girls will be born in the future because today’s women, in both rich and poor countries, suffer from increasing pressureD.chronic stress is more decisive in influencing the women’s pregnancies 参考答案： B 推理题。题干要求根据整篇文章推导出一个结论，本文主要讲述了压力对于婴儿出生性别的影响，分别用一些数据和事实证明突发压力和慢性压力都有一定的影响，从中可以得出结论，就是突发与急性压力都会使得女孩出生率高一些。答案A、D文中并没有进行比较、缺少证据，C的内容也文中也没有提到。因此，正确答案为 B。
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