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  3. When you run, you put force that is equal to three times your body weight on your feet. The human foot contains twenty muscles.

When you run, you put force that is equal to three times your body weight on your feet. The human foot contains twenty muscles.

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问题    When you run, you put force that is equal to three times your body weight on your feet. The human foot contains twenty muscles. This means that there is a lot that can go wrong when you run.
   Most sports have some kind of running or jumping, so experts at many shoe companies work hard to design good sport shoes. First, a designer enters a plan for a shoe into a computer. Engineers then improve the design. A second computer designs a model for the shoe. Then a few pairs are made. Next, the shoe is tested.
   Different kinds of sports shoes are made for different uses. Some are made to help marathon (马拉松 ) runners save energy during a race. Some are made for the stop-and-go kind of running tennis players. But all sport shoes have one thing in common: they are designed to help people’ s feet comfortable during sports. Today, nearly every sport has its own special shoe designed for just the kind of running that sport needs.
Why are good sport shoes popular among people?
选项 A、Because they are comfortable to wear.
B、Because they help to develop leg muscles.
C、Because they help to change body weight.
D、Because they are both good and cheap.
答案A
解析 根据第三段“they are designed to help people’s feet comfortable during sports．”可知这些鞋子是为了使人们在运动的时候脚部感到舒服而设计的，所以是穿起来很舒服，A正确。故选A
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