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第1题

John is very happy to have a _______ training. A. two weeks B.two-week C.two month D.two-month E.two days
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第2题

[判断题,10分] Ca2+、Mg2+和HCO3-所形成的硬度叫永久硬度。 A.正确 B.错误
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第3题

People in America eat much ______. A.coffee B.onions C.beef D.iced water
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第4题

Phyllis ______ influenza when she was in New York. A.came out with B.came down with C.came up with D.came to terms w
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