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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.
How many steps are there in making of a shoe?
选项 A、Three.
B、Four.
C、Five.
D、Six.
答案C
解析 根据第二段“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．”可知做鞋子是需要五个步骤，故选C。
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