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

【2017届江苏省高考英语一轮复习：选修7 Unit 2课时提升作业(牛津译林版)】相关文章：

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (8)

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十)选修6Unit 5《The power of nature》

★ 2017届高考英语二轮复习大题冲关秘籍阅读理解七选五：考纲解读（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (79)

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修6 Unit 4 Global warming

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练十

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修4 unit1《Women of achievement》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (44)

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：创新押题（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修2 Unit 3《Amazing people》