题目

（1）物质a是        ，在动物细胞内，动物细胞中与物质A作用最相近的物质是        。 （2）物质b是               ，若某种B分子由n个b分子（平均相对分子质量为m）组成的2条链组成，则该B分子的相对分子质量大约为                                 。（3）物质c在人体细胞中共有            种，分子中            不同，决定了c的种类不同。 （4）若某种物质B的生理作用是具有免疫功能，则B的合成以及根据对话内容, 选择恰当的句子补全对话. 每空1分. （有多余选项）. A. You should go to an English corner. B. What can I talk about C. You should learn English well. D. What's the problem E. You should speak first. F. What can I do for you G. You should go out more. (B: Bill F: Bill's friend)F: What's wrong, Bill You are not looking happy. B: I'm not. I feel a little worried about my English. F: _ B: I'm not getting along well with it. F: Why not B: Well, I seldom have chances to meet English people. F: _ B: Where should I go F: _ B: But...it seems English people never speak to me. F: Ah!_ B: _F: The weather!English people are always interested in the weather.