4．A　本段说的是饮食对于保护眼睛的重要性，故此处填A项。

　　5．F　本段说的是戴隐形眼镜存在的问题。根据空格处的下一句应该为：否则你会眼疼或者更严重的情况，可知此处意为：戴隐形眼镜要听医嘱。

　　Ⅲ.语法填空

　　(2017·乌鲁木齐三诊)

　　Mary：Hey, John. I hope you haven't been __1__(wait) too long on such a hot day.

　　John：No. I just got here a few minutes __2__. Do you know if smoking is allowed here?

　　Mary：No. This is a __3__ place! You are always smoking. __4__ do you feel when you are smoking?

　　John：Smoking __5__(make) me feel relaxed. I am used to having a cigarette every now and then especially when I am __6__(bore)．

　　Mary：How much do you smoke a day?

　　John：I smoke about twenty cigarettes a day.

　　Mary：Well, that's too many. I think you should quit. You know it's bad for your health.

　　John：I've always known it is bad, but I have never thought about giving it

　　__7__. And the

　　people

　　__8__

　　work with me smoke, too.

　　Mary：You'd better start thinking about it now. You might not feel the

　　__9__(different) now, but after 10 years of smoking, you might feel it, and then it would be too

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