第二节：语法填空（共10小题，每小题1.5分，满分15分）
Exercise is good for you, but most people really know very little about __31___ to exercise properly. So when you try, you __32___ 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 __33___ exercise burns fat from all over the body.
Studies show muscles which are not exercised lose their strength very quickly. To regain it __34___ (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 __35___ (exercise). Sweating only reduces body temperature to prevent heating. This is nothing __36___ water loss.
Walking is the best and easy-to-do exercise. ___37__ helps the circulation of blood throughout the body, and has a direct effect ___38__ your overall feeling of health. Experience says that 20 minutes’ exercise __39___ day is minimum amount. But if your breathing doesn’t return to normal state within minutes __40___ you finish exercising, you’ve done too much.