Scientists have been struggling to find out the reason behind blushing (脸红). Why would
humans evolve(进化) a 21 that puts us at a social disadvantage by 22 us to reveal that we have cheated or lied?
Charles Darwin pointed out that 23 all people of all races blush，animals do not. When it came to explaining the reason, he was 24 a loss. That has not stopped others from trying.
One 25 is that blushing started out as a way to show we obey authoritative members of the group. Later, as our social interactions became 26 complex, it became involved with higher, self-conscious 27 such as guilt, shame and embarrassment. This would seem to put individuals at a disadvantage，but blushing might actually make a person more 28 or socially desirable.
29 that women blush more than men，one university researcher suggests that blushing might have evolved as a way for women to 30 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 31 a stone-faced partner，you could never 32 what he wants. “he says.
Once blushing became 33 with embarrassment, anyone who did not blush might have been at a disadvantage because we are 34 likely to trust someone who appears never to feel 35 about anything. 【題組】30. (A) assure (B) approve (C) confirm (D) demonstrate
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