CD8+T细胞活化的协同刺激信号是（）。 A.IL-1受体的表达 B.IL-2的作用

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问题单项选择题

CD8⁺T细胞活化的协同刺激信号是（）。

A.IL-1受体的表达

B.IL-2的作用

C.IL-5的作用

D.TCR识别Ag肽-MHCⅡ类分子复合物

E.CD8⁺T细胞与APC间黏附分子及协同刺激分子的作用

答案

参考答案：E

填空题

A．We’ll live on the space station.

B．What will you do there?

C．Oh, I think our life will be much better.

D．We’ll fly a spaceship to get there.E. Will you have a good time there?

F. Maybe everyone will enjoy his life there.

G. Will there be banks, schools and shopping malls?

A: What do you think our life will be like in 50 years?

B: 1

A: Where will we live?

B: 2

A: How will we get there?

B: 3

A: Will life be interesting there?

B: Yes. I think it will be more interesting.

A: 4

B: Of course there will. I think the shopping malls will have all kinds of things and we will take everything for free.

A: Sounds great. 5

B: I agree. People will have a happier life.

单项选择题

锅炉炉膛内烟气与水冷壁的主要换热方式是( )换热。

A．对流

B．辐射

C．传导

D．传递