深证成份指数的样本股数量为（）。 A.30 B.40 C.50 D.60_爱下问搜题

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问题单项选择题

深证成份指数的样本股数量为（）。

A.30

B.40

C.50

D.60

答案

参考答案：B

填空题

从方框中选择适当的词填入句中的横线上。

made was taught studied walked

1. A: What did you do yesterday?
    B: I              Chinese.
2. A: What did your father do ten years ago?
    B: He              English at No. 3 Middle School.
3. A: What did your mother do last night?
    B: She              a cake for me.
4. A: How did she go to school?
    B: She              to school.
5. A: What was your mother many years ago?
    B: She              a teacher.

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简述免疫应答的基本过程和类型。