1、2013年6月份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 47 risk of injury. The human body is designed to walk. You can walk in parks or along a river or in you
2、r neighborhood. To get 48 benefit from walking, aim for 45 minutes a day, an average of five days a week. Strength training is another important 49 of physical activity. Its purpose is to build and 50 bone and muscle mass, both of which shrink with age. In general, you will wan
3、t to do strength training two or three days a week, 51 recovery days between sessions. Finally, flexibility and balance training are 52 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 o
4、f joints, many of them are 53 , and simple flexibility training can 54 these by making muscles stronger and keeping joints lubricated. Some of this you do whenever you stretch. If you watch dogs and cats, youwill get an idea of how natural it is. The general 55 is simple: whene
5、ver the body has been in one position for a while, it is good to 56 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) p
6、revent L) principle M) provoke N) seriously O) topic 答案：47. 答案：H. lowest 【解析】： 根据上下文可以判断需要选择一个形容词来修饰risk，根据句子意思，需要选择lowest“最低的”，句子的意思是：人人都知道怎么步行，并且步行受伤的风险最低。因此正确答案为H. lowest。 48. 答案：J. maximum 【解析】： 根据上下文可以判断需要选择一个形容词来修饰maximum，根据句子的意思，需要选择maximum“最大的”，句子的意思是：为了从
