The teacher encouraged his students_____ English hard. [ ]A. study B. to study C. studying D. studie

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• 调查是科学探究常用的方法之一．调查时，应明确______和______，制定合理的______，并对调查过程所做的记录进行______和______，必要时进行数学统计．如果调查的范围很大，可选-生物
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