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听力题目：
15.(A). People in the hall were surprisingly relaxed.
(B). The hall had a strange odor.
(C). Someone found a few cents in the hall.
(D). The lecturer tried to calm the rowdy students.
16.(A). Professor Stone doesn’t plan to retire for years.
(B).Every year Professor Stone talks about retiring.
(C). Each year Professor Stone retreads his tires.
(D). Professor Stone has been threatened many times.
