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听力题目：
17. (A). Only the brief questions were answered.
(B). Someone was asked to give a speech.
(C). The speaker spent a short while answering questions.
(D). Someone arrived after the speech to ask some questions.
18. (A). It didn’t matter when we studied.
(B). It was hard to study all of it.
(C). We studied the difficult things last.
(D). We didn’t study very much.
