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【简答题】
Their age is from 13 to 19. They are called t_______________.
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反馈参考答案：
举一反三
【简答题】若a=1- 2 ，先化简再求 a 2 -1 a 2 +a + a 2 -2a+1 a 2 -a 的值．
【单选题】听力原文：W: What size do you wear? M: A twelve. W: Oh, you're lucky. I have just the right size in store. Here it is. Why don't you try it on? Where does the conversation probably take place?
A.
In a clothing store.
B.
At the woman's home.
C.
In the sitting room.
【简答题】怎样通过实验区别 n 型半导体和 p 型半导体?
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