填空题

A.sew
B.flew
C.threw
D.blew

【参考答案】

A
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The U. S. is trying to reduce joint replacement failure rate by ()

A. strictly controlling the number of replacement operations
B. asking hospitals to follow up each case for 12-18 months
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单项选择题
Defied in the 5th paragraph probably means ()

A. doubted
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C. challenged
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