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问题 单项选择题

人群中ApoE可有几种不同的表型

A．3种

B．4种

C．5种

D．6种

E．7种

答案

参考答案：D

解析：考查ApoE基因的多态性，它一共有3种，分别这ε2、ε3和ε4，所以组成的表型就有6种。

填空题

用所给单词的适当形式填空。

1. What about           _ ( sing) this song in English?

2. The weather           _ ( be) windy today.

3. There are some students ______ (play) on the playground.

4. Look! The dog _  __    (eat) the meat.

5. It's              ( cloud). It's going to rain.

6. It often         __ (snow) in the north of China in winter.

7. I enjoy _           (I) very much in the game.

8. They have a lot of' fun _  _    _ ( dance)  at the party.

9. I'm very _          (excite) to hear the good news.

10. It's ______ (sun) today. The sun is shining brightly in the sky.
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单项选择题

患儿，2岁，唇颊面浅凹状龋，探龋蚀较浅，疼痛（-）。患儿哭闹不合作。应选处理方法（）

A.复合体充填

B.玻璃离子充填

C.氨硝酸银涂布

D.氟化钠涂布

E.氟化双氨银涂布
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