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【单选题】
Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. 听力原文：M: Would you like me to get the film developed for you at the store? W: Could you wait until I finish the other roll? Q: What does the woman mean? (12)A.
She doesn't need a new roll of film yet.
B.
She still hasn't finished the first roll.
C.
She'll soon have two rolls to be developed.
D.
She'd like him to develop the first film for her now.
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举一反三
【单选题】下面关于半导体的说法正确的是( )。
A.
P型半导体中多数载流子是空穴，所以P型半导体带正电
B.
N型半导体中多数载流子是电子，所以N型半导体带负电
C.
P型和N型半导体本身都不带电
D.
P型和N型半导体都带正电
【判断题】教学的过程不是刻板机械地完全照搬设计方案,教学设计是否合理、有效,应该在践的过程中不断进行评价和修正,使教学设计方案与实践相互适应、相互调整。( )
A.
正确
B.
错误
【多选题】有关导体、半导体和绝缘体,下面说法正确的是:
A.
(a) 半导体导电能力好于绝缘体的原因在于其禁带宽度较窄，常温下便会有一个数量的价带电子得到的能量超过禁带宽度而进入导带进而能与导电。
B.
(b) 绝缘体导电能力差的原因在于其禁带宽度太宽，常温下一般价带电子得到的能量很难超过禁带宽度。
C.
(c) 导体导电能力强的原因在于其导带就是一个不满带，直接就可以导电。
D.
(d) 导体、半导体只有电子参与导电，绝缘体是电子和空穴都参与导电。