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第1题

间歇强化的主要形式不包括 A.固定间隔 B.可变间隔 C.固定比率 D.连续比率
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第2题

(4分)According to the national survey by the CDCOSH, we can know that less than 3 million kids between the ages of 12 and
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第3题

4分)Pechacek thought that the rate which students are receiving some information is far higher than what is recommended.
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第4题

(4分)The whole family died of _________ during the flood in June. A. drought B. thirst C. disaster D. famine
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