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听力习题：

　　17.

　　A. Some students at the back cannot hear theprofessor.

　　B. The professor has changed his readingassignment.

　　C. Some of the students are not on the professor'slist.

　　D. The professor has brought extra copies of hisassignment.

　　18.

　　A. She doesn't want to talk about the contest.

　　B. She's modest about her success in the contest.

　　C. She's spent two years studying English in Canada.

　　D. She's very proud of her success in the speech contest.

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