问题
名词解释
主要组织相容性复合体（MHC）
答案
参考答案：
是位于脊椎动物某对染色体的特定区域、紧密连锁的编码主要组织相容性抗原系统的基因群，其编码产物主要分布在细胞膜表面，在免疫应答过程中起重要作用。
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主要组织相容性复合体（MHC）
参考答案：
是位于脊椎动物某对染色体的特定区域、紧密连锁的编码主要组织相容性抗原系统的基因群，其编码产物主要分布在细胞膜表面，在免疫应答过程中起重要作用。
| 补全对话。 | |
| M: What's wrong with you, Linda? You look unhappy. W: (1)__________________________________________. M: Really? What happened to you? W: Well. I walked to school… M: Why? Didn't you go to school by bike? W: At first, I rode my bike. (2)______________________. I couldn't repair it. M: So you were late for school! W: I'm not allowed to go to class late, and there was a big test today. M: (3)___________________________________? W: That's right. (4)_____________________________________________ M: Well, Linda, the school has to have rules you know. W: I know. But I should be allowed to take the test later. It's not fair. M: I agree. (5)______________________________________________ W: Yes. Maybe she'll understand, if I explain what has happened.
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