The second half of the skeleton building equation(等式)is exercise. For optimum(最适宜的)bone health, the Surgeon General recommends that children get 60 minutes of weight-bearing(负重)or strengthening exercise a day. As with muscles, bones grow stronger with use; plenty of exercise means plenty of bone health. “If you do an hour of exercise a day, it doesn’t matter so much what it is, ”Raisz says. “You’re telling your bones they’ve got to grow! ”

　　1. According to Dr. Lawrence Raisz, why will many Americans have weak bones in the future?

　　A. Because their body will stop building bones.

　　B. Because they are not familiar with the structure of the body.

　　C. Because they have an unhealthy diet and do not exercise enough.

　　D. Because they can’t afford a qualified doctor.

　　2. Which of the following is NOT the important factors for building up strong bones?

　　A. Calcium.

　　B. Exercise.

　　C. Vitamin C.

　　D. Vitamin D.

　　3. The author explains the influence of calcium on the human body by.

　　A. comparisons B. figure of speech

　　C. numbers

　　D. an example

　　4. We can learn from the article that.

　　A. the storage of calcium in our body doesn’t change even when we grow old

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