四六级

　　在英语六级考试中，听力与单词一样，都是需要长期坚持训练的。小编帮大家准备了英语六级听力练习题系列，这是练习题23，希望对大家2017年6月英语六级考试备考有帮助。

　　2017年6月英语六级听力备考：听力练习题大全

2017年6月英语六级听力练习题23.mp3

　　试题选项：

　　Now listen to the following recording andanswer questions 20 to 22

　　20

　　A.Character.

　　B.Smell.

　　C.Gene.

　　D.Age.

　　21

　　A.The friends' genes are more different than that of the strangers.

　　B.The friends are as biologically close as their brothers.

　　C.The friends must have shared a common ancestor.

　　D.The friends have more DNA in common than strangers do.

　　22

　　A.It offers us more pleasure.

　　B.It helps us to survive.

　　C.It helps us to make friends.

　　D.It makes us better understood.

　　听力原文：

　　It appears that when it comes to choosing our friends, much of our choice depends on genes. We are more genetically similar to our friends than we are to strangers.

　　The theme song to Friends, a 1990s American situation comedy about a bunch of best mates. Two of the characters were related, but if they've been real life friends, the rest of them could have been as biologically close as cousins. Researchers from the University of California have analyzed gene variation in around 2,000 people, comparing pairs of unrelated friends with pairs of unrelated strangers. They found that the friends had about 0.1% more DNA in common on average than strangers did. It's a small fraction that makes a big difference.

　　It's sort of like their family members. And in fact the number of genes they share in common is so large. And that is almost that they share a common ancestor. It's like their fourth cousins.

　　The friends were most alike when it came to their sense of smell, but the study suggests that we could be attracted to people with similar traits because it helps us to survive.

　　If you are the first person that has a mutation and you don't have any friends, you need surround yourself with other people who also have that trait. This is not just the case that people with the best trait, it's the people who have similar genes.

　　When it comes to our immunities though, the friends, genes were more different than that of the strangers. The scientists say this trend could also give us an evolutionary edge though because if your friends can fight different diseases than you, you are less likely to spread those diseases. It gives a new meaning perhaps to being their bio-friends.

　　Question 20. What does our choice of friends probably depend on according to the lecture?

　　Question 21. What do the researchers from the University of California find?

　　Question 22. Why are we attracted to people with similar traits according to the study?

　　参考答案：

　　【小题20】C

　　【小题21】D

　　【小题22】B

　　习题解析：

　　【小题20】听力原文中明确提到It appears that when it comes to choosing our friends, much of our choice depends on genes.由此可知，在结交朋友时，我们的选择似乎取决于基因，故选C。

　　【小题21】听力原文中提到Researchers from the University of California... found that the friends had about 0.1% more DNA in common on average than strangers did.即加利福尼亚大学的研究者发现朋友之间比陌生人之间平均多 0.1%的共同 DNA，故选D。

　　【小题22】听力原文中提到the study suggests that we could be attracted to people with similar traits because it helps us to survive，即研究表明我们被具有相似特性的人吸引，是因为这有助于我们生存，故选B。

　　2017年6月英语六级听力备考：听力练习题大全

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