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问题 单项选择题

已知市场需求函数为Qa=1000-200P，供给函数为Q=-500+400P，则均衡价格和均衡产量分别为()。

A．2.5、500

B．3、400

C．5、1500

D．1.25、750

答案

参考答案：A

单项选择题

CD8分子

A．与MHC-Ⅱ类分子的胞外Ig样区(恒定区)结合

B．与MHC-Ⅰ类分子的胞外Ig样区(恒定区)结合

C．直接与肽抗原结合

D．与靶细胞上的黏附分子结合

E．其余选项都不对
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阅读理解

Mrs. Green is going to give a birthday party for her daughter Jenny. Jenny is going to be twelve years old.  A lot of Jenny’s friends are going to come to the party.

Mrs. Green is getting readay for the party. Mr. Green is helping her. He is putting the big birthday cake on the table. It’s a nice cake.

Now it’s five o’clock in the afternoon. Everything is ready. The party is going to begin in ten minutes.

小题1:Mrs. Green is going to give a birthday party for ___.

A.Mr Green  B. Mrs. Green  C. Jenny

小题2:_____ are going to come to the party.

A.Jenny’s friends  B. Jenny’s teachers  C. Jenny’s uncles and aunts

小题3:What’s on the table?

A. Some fruit  B. A birthday cake  C. A lot of cards

小题4:When is the party going to begin?

A. At 5:00p.m  B. At 5:30 p.m  C. At 5:10 p.m  

小题5:Jenny is a ____ girl.

A. 12--year --old  B. 12--years--old  C. 11—years—old
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