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一What did Mr.Jones do before he came to this company?一He ___

一What did Mr.Jones do before he came to this company?一He __________ a city bus

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主成分为含水硫酸钠(Na2S04•10H20)的药材是A.石膏 B.磁石 C.芒硝 D.滑石 E.信石

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