Question

阅读理解

　　For most of us, body weight goes up with age－an average of one pound a year after 25, according to the American Medical Association. What’s more, added weight is likely to be composed primarily of fat, not muscle. The reasons are as follows.

　　1)As we age, most of us become less active, and the body’s basal metabolism(基础代谢) rate slows a little each year. So our food-energy requirements－the number of calories needed to maintain weight-decrease. For example, a man might require 2500 calories a day at age 20, 2000 at 35 and only 1800 at 15.

　　2)Starting in our 20s, the proportion of muscle mass to body fat tends to decline. The body of an average 20-year-old woman is 26.5 percent fat. By 35, it is 33 percent, at 50, 42 percent.

　　3)As we grow older, we shrink-not from side to side, unfortunately, but from top to bottom. In our mid-30s, we begin to lose more bone than we make. One result: less height to hang our weight on, which makes us look thicker than we once did.

　　4)Exercising becomes harder with age. Our muscles can begin to lose strength and elasticity (弹性) as early as age 20. By 40, heart and lung power has begun to drop, and the body becomes more likely to be injured.

1．What is the passage about?

[　　]

A．The reason why old people usually weigh more than they once did.

B．The reason why added weight is likely to be composed primarily of fat, not muscle.

C．The reason why we become less active when we age.

D．The reason why our body weight goes up one pound: a year after 25.

2．What does the writer mean by“As we grow older, we shrink”?

A．As we grow older, we become shorter.

B．As we grow older, we become thinner.

C．As we grow older, we become more depressed.

D．As we grow older, we become more active.

3．Why does exercising become harder with age?

[　　]

A．Our muscles are older and weaker.

B．The possibility of injury increases.

C．Heart and lung don’t work as well as before.

D．All of the above.

4．Which of the following is true according to the passage?

[　　]

A．The body weight increases as one grows older.

B．The basal metabolism rate of an active person is always very high.

C．The food-energy requirement for one certain person is fixed.

D．We need less calories to maintain our weight as we grow older.

5．Where is this passage likely to appear?

[　　]

A．In a newspaper.

B．In a magazine.

C．In a novel.

D．In an advertisement.

Answer 1

答案：D;A;D;D;B
解析：

1．整篇文章都是在谈人为什么会在25岁后发胖，而且列出了4条理由，所以答案应是D。 　　2．文中的第三条讲到随着年龄增长人体会缩短，from top to bottom，所以答案是A。 　　3．见理由的第四条。 　　4．第一条理由的最后一句话。