7．C。考查推理判断。根据第二段的内容可知，研究者变换了对婴儿的刺激方式，是为了更深入地进行研究。因此研究者让婴儿听鼓声是为了进行深入的研究。

　　8．D。考查推理判断。本文介绍了对婴儿进行的试验、试验的经过、结果等，因此本文可能来自于一份科学报告。

　　Ⅴ. 短文改错

　　Recently the issue of students' study has brought to public attention. Students are anxious about what to improve their scores. Some work very hard. They spend all their time in study.

　　They do nothing except to study.

　　As far as I'm concerned, it is not a good way to study. Alternating work with rest was the best way to study well. Students should try their best to learn knowledges as Francis Bacon said,

　　“Knowledge is power.”

　　Therefore, students should have other recreational activities to relax themselves, because people can do things more efficient after relaxing themselves. What's more, people can obtain knowledge from many sources besides books, that is beneficial for study.

　　Thus, combining exertion and rest are the best to study.

　　答案：

　　Recently the issue of students' study has

　　brought to public attention. Students are anxious about

　　to improve their scores. Some work very hard. They spend all their time

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