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
【C4】

选项

答案I

解析 根据上下文可以判断需要选择一个动词原形与build作并列成分,根据句意“力量训练的目的是增强和骨骼和肌肉质量”,所以选择maintain“维持”符合文意。因此正确答案为I项maintain。
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