2. 外语
  3. Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, e

Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, e

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问题     Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, everyone knows how to do it and it carries the【C1】______ risk of injury. The human body is designed to walk. You can walk in parks or along a river or in your neighborhood. To get【C2】______ benefit from walking, aim for 45 minutes a day, an average of five days a week.
    Strength training is another important【C3】______ of physical activity. Its purpose is to build and【C4】______ bone and muscle mass, both of which shrink with age. In general, you will want to do strength training two or three days a week,【C5】______ recovery days between sessions.
    Finally, flexibility and balance training are【C6】______ important as the body ages. Aches and pains are high on the list of complaints in old age. The result of constant muscle tension and stiffness of joints, many of them are【C7】______ , and simple flexibility training can【C8】______ these by making muscles stronger and keeping joints lubricated (润滑). Some of this you do whenever you stretch. If you watch dogs and cats, you’ll get an idea of how natural it is. The general【C9】______ is simple: whenever the baby has been in one position for a while, it is good to【C10】______ stretch it in an opposite position.
[A] allowing [B] avoidable
[C] briefly [D] component
[E] determined [F] helping
[G] increasingly [H] lowest
[I] maintain [J] maximum
[K] prevent [L] principle
[M] provoke [N] seriously
[O] topic
【C9】
选项
答案L
解析 根据上下文可以判断需要选择名词与general“一般的，大体的”搭配，根据后文可知选择principle“原则”。因此正确答案为L项principle。
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