单项选择题
Questions 11 to 18 are based on the conversation you have just heard.
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A.Skip the professor’s class.
B.Talk with the professor.
C.Perform in a concert.
D.Go to enjoy the concert.
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The first tennis balls ______ (是由皮革里面塞满羊毛或是毛发制成的).
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单项选择题
A.observedB.notifiedC.commentedD.detected
A.observed
B.notified
C.commented
D.detected
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