D. impress

　　③Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.A. of；at　 B. by；in

　　C. of；on　 D. on；at

　　The drug did not ________ his health; in fact, it seemed to have no ________ on him at all.

　　A. effect; affect

　　B. effect; effect C. affect; effect

　　D. affect; affect

　　考点-.concentrate

　　【教材原句】Many teenagers are surprised to learn that when you exercise, your body produces some chemicals that make you feel peaceful and relaxed and increase you’re ability to concentrate when you study.

　　(P58) 很多青少年吃惊地发现，锻炼过程中体内会产生某些化学物质，这些化学物质使人感到平和与放松，增强学习时集中注意力的能力。

　　【例句研读】①He can concentrate on a book very long.

　　他能长时间。

　　②The boy is concentrating on playing computer games.

　　这个男孩玩电脑游戏。

　　③It is important for students to concentrate their attention on their studies.

　　对于学生来说，很重要。

　　【自主归纳】

　　concentrate v. 集中(注意力、思想等)；全神贯注→

　　n. 集中concentrate (sth.) on (doing) sth.

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