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听力题目：
15.(A). I don’t think you will have any difficulty.
(B). I’m not the course of your problems.
(C). I’m sorry to have inconvenienced you.
(D). I came because I heard you were in trouble.
16. (A). They were eager to go on the tour.
(B). They viewed an exhibit on tool-making.
(C). They went to the museum even though they were hungry.
(D). They developed an appetite during the tour.
