紫外线对DNA的主要损伤是（） A.碱基缺失 B.碱基插入 C.碱基置换 D.嘧啶二

当燃气管道穿越卧室、地下室时，必须采用丝扣连接。

用括号内所给动词的适当形式填空。

1. English _____ (speak) here.

2. At last, I _____ (find) him in the park.

3. The room _____ (paint) now.

4. Listen! Who _____ (cry) in the next room?

5. The computer _____ (can, use) in the room.

6. My grandpa _____ (die) for three years.

7. The novel _____ (translate) into many languages since it was published.

8. The cake which my mother made _____ (smell) nice.

9. The football match _____ (show) again sometime next week.

10. The book _____ (sell) well.

试比较清初与清中叶浙派的异同。

反映肝细胞损伤最敏感的酶是（）。

A.ALP

B.GGT

C.ALT

D.MAO

E.AST

学校心理健康教育的三大任务是什么？