Walking, if you do it vigorously enough, is the overall best exercise for reg

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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 body 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 [br] 【C8】

选项

答案 K

解析根据成分分析可以判断这里需要动词，情态动词后连接的应该是动词原形。根据文意可以推断此处是说这种训练可以阻止上述的问题发生。故此处选prevent。

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Walking, if you do it vigorously enough, is the overall best exercise for reg

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