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问题 问答题

大多数中国人一天不能喝太多鲜奶。牛奶中有乳糖，需要有一种叫做“半乳糖苷酶”的酶来分解乳糖以供人体吸收。可是汉族人缺少这种酶，这是基因决定的，一般人一天喝500mL奶就有不舒服的反应，甚至腹泻。但西方人拿牛奶当水一样喝，再多也没事。你认为这与基因多样性有什么关系？

答案

不同人种的人的基因不同，甚至每一个人的基因组都是不同的，这充分说明了基因的多样性

填空题

根据句意及所给提示完成句子。

1. Eating too much _______(糖果) is not good for people's teeth, especially kids' teeth.

2. Tiantian spent much time reading _______ (连环漫画) when she was very young, now she still likes

    reading them when she is free.

3.  Her life has _______ (改变) a lot in the last few years.

4.  China will spend 71.7 million dollars _______ (建造) an airport named "Ping'an" near Mount Everest.

5. Some teenagers like _______ (聊天) with others online.

6. It's very expensive to go on a trip by a _______, but it's the fastest way to travel.

7. Watching TV can open up our eyes to the world, but it is a bad habit to s _______ too much time on it.

8. Li Gang couldn't find his dog, so he was very w_______ about it.

9. —What's another girl's hobby?  

    —She is interested in r_______ books.

10. He should give up s _______ because it can cause lung cancer (肺癌).
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单项选择题

以下哪一种粘附分子属于整合素家族（）

A.ICAM-1

B.LFA-1

C.LFA-2

D.LFA-3

E.ICAM-2
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