题目内容
According to the last paragragh, consumers who believe that organic foods axe better than conventionally grown foods are often ______.
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From the passage we can draw the conclusion that long periods of sleeplessness may produce ______.
There is no reason why you should tell them ______ that you are going.
______ had I closed the door ______ somebody started knocking at it.
( )是基于因果关系的基本逻辑，把研究问题置于特定场境中，通过严格的控制和策划，使得所研究变量及其关系得以体现。
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