2. 专升本
  3. Scientists have been struggling to find out the reason behind blushing (脸红). Why would humans evolve(进化) a 【C1】____ that puts us

Scientists have been struggling to find out the reason behind blushing (脸红). Why would humans evolve(进化) a 【C1】____ that puts us

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问题     Scientists have been struggling to find out the reason behind blushing (脸红). Why would humans evolve(进化) a 【C1】____ that puts us at a social disadvantage by 【C2】____ us to reveal that we have cheated or lied? Charles Darwin pointed out that 【C3】____ all people of all races blush，animals do not. When it came to explaining the reason，he was 【C4】____ a loss. That has not stopped others from trying. One 【C5】____ is that blushing started out as a way to show we obey authoritative members of the group. Later，as our social interactions became 【C6】____ complex，it became involved with higher，self-conscious 【C7】____ such as guilt，shame and embarrassment. This would seem to put individuals at a disadvantage，but blushing might actually make a person more 【C8】____ or socially desirable. 【C9】____ that women blush more than men，one university researcher suggests that blushing might have evolved as a way for women to 【C10】____ their honesty to men so as to win their support in raising children. Some zoologists also think blushing could have emerged as a way to foster trust. " If you were to go hunting 【C11】____ a stone-faced partner，you could never 【C12】____ what he wants. “he says. Once blushing became 【C13】____ with embarrassment，anyone who did not blush might have been at a disadvantage because we are【C14】____ likely to trust someone who appears never to feel 【C15】____ about anything.
【C3】
选项 A、when
B、while
C、since
D、because
答案B
解析
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