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’ 11 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
【C8】
选项
答案K
解析 根据上下文可以判断需要选择动词原形，该句话中的these指代上文的“长期肌肉紧张和关节僵硬”，下文中提到“通过使肌肉更强壮，关节更灵活”，可知动词应该为prevent“预防，阻止”。因此正确答案为K项prevent。
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