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问题 单项选择题 A1/A2型题

在手部皮肤上定植的正常菌群是（）

A.暂住菌

B.常住菌

C.外籍菌

D.过路菌

E.定性菌

答案

参考答案：B

解析：手部皮肤的细菌分为暂住菌和常住菌，暂住菌主要是通过接触而附在皮肤上，常住菌则是指皮肤上定植的正常菌群。

填空题

一组数据2，4，x，2，3，4的众数是2，则x＝            ．
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完形填空

Dear friends,

I am a wolf from the north. I live in the w  小题1:  . And I am quite sad.

I live in a family group with my parents. We are friendly t  小题2:   each other and we look after each other. We can see, hear and smell things far a  小题3:  . We are good at hunting, but we never k 小题4:   for fun.

We used to live a happy life. But s  小题5:   , we have some serious problems now. Some people came last month and they destroyed(摧毁) a lot of forests. They wanted to build a highway. We lost many l  小题6:   areas. We had to move. But when we had a new home, people followed us and they cut down more trees. This time, they wanted to make the forest into farmland. As a r 小题7:  , we had to move again, but things didn’t get better. People came again and hunted us. They thought we were dangerous to h 小题8: . If people keep doing like this, it will l  小题9:    to fewer and fewer wolves in the world.

We are now in d 小题10:  . What can we do? Please save us!
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