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听力题目：
19.(A). She stops by the center every morning.
(B). She no longer buys her morning coffee at the center.
(C). Her coffee is better than the coffee at the student center.
(D). Her cough could be heard all over the student center.
20.(A). Theoretical chemistry is not just theoretical; it works.
(B). There’s an ongoing class in advanced theoretical chemistry.
(C).The workings of theoretical chemistry are discussed in an advanced course.
(D). Plans are being made for an advanced course in theoretical chemistry.
