问题
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According to the passage, how did knowledge about chemical processes increase before the s
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According to the passage, how do people usually classify a person into certain type?A.His
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According to the passage, the change of parent-children relationships has little to do wit
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How many hours do people work a week at present according to the passage?A.10 hours.B.20 h
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According to the passage how many methods are use
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According to the passage when people are doing la