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自然实验的主要优点在于它的控制比较严格,所获得的数据的可重复性高,数据比较可靠,结论经得起考验。 ( )
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个案法就是以某一个小学儿童为研究对象,收集其各种信息加以分析来检验发展假设的一种研究方法。 ( )
I had __________ reason to believe that she would keep my secret.
I must get to the shops__________ or other this afternoon. I haven’t got _________ in the house for supper.
In a rugby league game__________ side has 13 players.
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