1 . 选出能填入空白处的最佳选项以匹配对应小标题，选项中有两项为多余选项。
Principles of Running
·Do the right amount.         
·Keep running.         
·Cool down properly.         
① A warm-up gets your blood flowing and prepares your body before you exercise.
② Draw up a training plan that suits you. Make sure you are not running too much so that your heart, muscles and bones don’t get hurt.
③ A thirty-minute run will provide relief from aches or tension that you may be suffering due to stress.
④ Jog slowly for ten minutes after a long run, then walk for five minutes. Such kind of exercise relaxes your body.
⑤ There will be times when you want to give up. But hang in there and tell yourself that it will get easier with time.

A．①④⑤

B．②④⑤

C．②⑤④

D．③⑤④