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A: Hi, Lucy! How’s it (1)?B: Fine, thanks. And you?A: Just fine. Where are you (2) to?B: To the library. I’m going to have a history examnext week and need to start studying.A: Well, I’ll see you later then. (3)__!B: Thanks. See you later.

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A: Hey, Frank! How did your physics exam go?B: (1), thanks, Linda. I’m just glad it’s (2)!How about you? How did your presentation go?A: Oh, it went really well. Thanks for helping mewith it!B: You’re welcome. So do you (3) studyingfor our math exam tomorrow?A: Yeah, sure! Come over around 10:00, afterbreakfast.B: All right. I’ll bring my (4)_____.

A: Hey, Henry! What are you doing?B: I have been trying to solve this math problem for the last half hour, and I still (1)_____ how to do it.A: When do you have to turn it in?B: It is (2) at the end of this week.A: Well, it is only Monday. Why don’t you get some (3) from Professor White tomorrow?B: OK, I will do that. Thanks for your suggestion.

二极管的文字符号（）

A
B
C
D

二极管加反向电压后，外电场的方向与内电场的方向相同，空间电荷区（）。

A. 变窄
B. 不变
C. 变宽