完形填空

　　通读下面的短文，掌握其大意。然后从每小题的四个选项中选出可填入相应空白处的最佳选项。

　　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.

　　第21题单选 填入(21)处的最佳答案是(A)。

　　A. response

　　B. reply

　　C. reflection

　　D. recall

　　第22题单选 填入(22)处的最佳答案是( B)。

　　A.ding

　　B. forcing

　　C. encouraging

　　D. preventing

　　第23题单选 填入(23)处的最佳答案是(B)。

　　A. when

　　B. while

　　C. since

　　D. because

　　第24题单选 填入(24)处的最佳答案是(C)。

　　A. on

　　B. in

　　C. at

　　D. of

　　第25题单选 填入(25)处的最佳答案是(D)。

　　A. suggestion

　　B. advice

　　C. solution

　　D. question

　　第26题单选 填入(26)处的最佳答案是(D)。

　　A. apparently

　　B. completely

　　C. awkwardly

　　D. increasingly

　　第27题单选 填入(27)处的最佳答案是(C)。

　　A. moods

　　B. senses

　　C. emotions

　　D. tempers

　　第28题单选 填入(28)处的最佳答案是(D)。

　　A. privileged

　　B. embarrassed

　　C. energetic

　　D. attractive

　　第29题单选 填入(29)处的最佳答案是(A)。

　　A. Noting

　　B. Providing

　　C. Assuming

　　D. Hoping

　　第30题单选 填入(30)处的最佳答案是(D)。

　　A. assure

　　B. approve

　　C. confirm

　　D. demonstrate