题目内容

More and more people who live or work close to mobile phone masts get muscle aches, headaches, heart problems and stomaches.

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Extreme exercise is any activity that increases your heart rate and the amount of oxygen that your muscle burn.

If you go to school by bus, why not get off the bus two or three stops early and walk the rest of the way?

20世纪晚期的最大成就之一就是人均寿命大幅增长。

很多人要工作、照顾孩子、管理家务、休闲以及进行社交活动。