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单项选择

He_____ if you____ him tomorrow.

A. will come; will invite B. will come ;invite

C. comes; will invite D. comes ; invite

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完形填空

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项

Scientists study the world and learn about things using a process called the scientific method(方法). By asking important questions and   1   the answers, it is possible to make amazing discoveries! Sometimes a scientist is   2   to answer his own questions, but if he has taken good notes another scientist may come along later who is able to use new knowledge to answer it.

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