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  3. Walking is the easiest and simplest form of exercise. By putting one foot in front of the other, you can start to walk your ways

Walking is the easiest and simplest form of exercise. By putting one foot in front of the other, you can start to walk your ways

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问题      Walking is the easiest and simplest form of exercise. By putting one foot in front of the other, you can start to walk your ways towards a healthier lifestyle. Walking is an easy way to challenge the cardiovascular system (心血管系统), while at the same time building muscles. But to achieve these goals, a little more than a gentle walk around the block is required.
     Walking actually burns as many calories (卡洛里) as running the same distance —— if done in the correct manner and at a reasonable pace (步伐).
     Start with a basic program that you can complete three or four times a week. This should include five main steps:
   ——A beginning warm-up for about 5 minutes.
   ——A little bit faster period of 5 minutes at medium level (中等速度)
   ——A 10-minute “burning” at a high level.
   ——A 5-minute cool down period at a low level again.
   ——A suitable walking pace of around 5 kilometers per hour will burn around 80 calories in 30 minutes.
In the first 5 minutes of walking, you should walk ______.
选项 A、quickly
B、slowly
C、at top speed
D、at medium pace
答案B
解析 细节题。根据文章中提到的5个训练步骤，在第一个步骤中是warm—up(热身)，即准备阶段。根据常识，热身是慢慢开始的阶段。选择B比较合适。
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