问题补充：
B
Exercise is good for you, but most people really know very little about 36 to exercise properly. So when you try, you _ 37 run into trouble.
Many people believe that when specific muscles are exercised, the fat in the neighbouring area is “burned up”. Yet the truth is 38 exercise burns fat from all over the body.
Studies show muscles which are not exercised lose their strength very quickly. To regain it 39 (need) 48-72 hours and exercise every other day will keep a normal level of physical strength.
To lose weight you should always “work up a good sweat” when 40 _ (exercise). Sweating only reduces body temperature to prevent heating. This is nothing _ 41 water loss.
Walking is the best and easy-to-do exercise. _ 42 helps the circulation of blood throughout the body, and has a direct effect _ 43 _ your overall feeling of health. Experience says that 20 minutes’ exercise _ 44 day is minimum amount. But if your breathing doesn’t return to normal state within minutes 45 you finish exercising, you’ve done too much.36. how 37. may/can/will 38. that 39. needs 40. exercising 40. but 42. It 43. on 44. a/per 45. after
答案：
(答案→)36. how 37. may/can/will 38. that 39. needs 40. exercising 40. but 42. It 43. on 44. a/per 45. after
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