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　　1.单选题

　　[阅读选择]Do you think sitting and studying all the time will improve your grades? Think again. Getting some exercise may help， too.

　　New research with older people suggests that taking regular walks helps them pay attention better than if they didn‘t exercise.

　　Walking regularly helps elderly people______.

　　A、lose weight

　　B、become happier

　　C、concentrate better

　　D、look younger

　　正确答案：C

　　答案解析：同义词替换有题干替换、选项替换。

　　2.单选题

　　[阅读选择]Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown partly because few people are willing to submit to such a strict diet.

　　According to the passage， we do not know whether humans will benefit from taking in fewer calories partly because______.

　　A、humans， worms and rodents are different.

　　B、most people are not willing to be put on a strict diet.

　　C、the effect is not known.

　　D、genetic changes in tissues can not be performed on humans.

　　正确答案：B

　　答案解析：本题答案可从本段的最后一句话中找出。

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