A
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 sports 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 runners save energy during a race. Some are made for the stopandgo kind of running tennis players. But all sports shoes have one thing in common: they are designed to help make people's feet comfortable during sports. Today, nearly every sport has its own special shoe designed for just the kind of running that sport requires.
21．The first in making a new shoe is to ________.
A．make a computer
B．design a shoe model
C．put a design plan into a computer
D．test several pairs
22．Why are good sports shoes popular with people?
A．Because they help to change body weight.
B．Because they help to develop leg muscles.
C．Because they are comfortable to wear.
D．Because they are both good and cheap.
23．Different kinds of sports shoes ________.
A．are made in different shoe companies
B．meet the needs of different sportsmen
C．are of the same price
D．are designed for people of different weight
答案与解析
人的脚上有20块肌肉，当我们跑步时，有些肌肉可能会受伤。因此鞋类公司的设计人员设计出不同种类的运动鞋来满足不同运动的需要。
21．C 细节理解题。根据第二段中的“First, a designer enters a plan for a shoe into a computer.”可知答案。
22．C 细节理解题。根据最后一段中的“But all sports shoes have one thing in common: they are designed to help make people's feet comfortable during sports.”可确定答案。
23．B 推理判断题。根据文章最后一段的内容可知，不同种类的运动鞋可以满足不同运动员的需求。
