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【多选题】
N型半导体主要靠 导电，P型半导体主要靠 导电 。A.
自由电子
B.
空穴
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【简答题】—Any advice on how to protect pupils’ eyesight? —It’s helpful for them not to ____ bright light. A．look on B．look into C．look for D．look through
【单选题】听力原文：M: The light in this dining hall is a little too bright, don't you think? W: I'd say it's perfect for a football stadium. Q: What does the woman mean? (14)
A.
She prefers the stadium.
B.
She agrees with the man.
C.
The light isn't bright enough.
D.
The dining hall isn't large enough.
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