截止2010年底，我国已在25个省、市、自治区和近海海域，开展了油气资源勘查工作，在

若2a³ⁿ与﹣3a⁹的和仍为一个单项式，则n=(      )

用所给单词的适当形式填空。

1. He _____(read) newspaper in the garden when the earthquake happened.

2. There _____(be) a football match this evening. So I must finish my homework now.

3. The weather will become _____(bad) on Friday than before.

4. He is _____(terrible) ill. He must stay in bed.

5. Could you give me some good _____(advice) on how to learn Physics well?

6. Mike, like the other boys in his class,_____(enjoy) dancing.

7. Look, here _____(come) the bus.

8. I think they _____(fly) to Paris in two days.

9. He doesn’t know what _____(do) with the naughty boys.

10. It is eight o’clock in the evening. Mr Green _____(watch )TV.

有限责任公司与股份有限公司的最主要的区别在于（    ）

A．股东人数的规定

B．注册资金的多少

C．财务是否向社会公开

D．是否向社会公开发行股票

Demand curve（or demand schedule） 需求曲线（或需求表）

下列哪些药物可引起上消化道出血（）

A.水杨酸钠

B.消炎痛

C.强的松

D.维生素K₃

E.路丁