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] 【C10】

选项

答案 C

解析这里需要一个副词来修饰动词stretch，可以与其搭配的是briefly，这里的意思是“短暂地，简要地”。

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

[originaltext]Walkingistheoldestwayofgettingaround—andstilloneof

[originaltext]Walkingistheoldestwayofgettingaround—andstilloneof