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【单选题】
当分子中的某一饱和碳原子与三个碳原子相连时,该碳原子称为______A.
伯碳
B.
碳
C.
叔碳
D.
季碳
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举一反三
【单选题】——Look at your pale face. You ______ a sleepless night. ——You bet. The work site next to the hotel was so noisy.
A.
must have had
B.
might have
C.
should have had
D.
cannot have had
【单选题】听力原文：M: I hear you got lost on your way to the meeting at the hotel. W: I don't know how I did it. I’ve been there a million times. Q: What does the woman mean? (13)
A.
She knew the way very well.
B.
She doesn't know where the hotel is.
C.
She thinks it's an expensive hotel.
D.
She got lost many times.
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