The Five Rules for Keeping Fit
Hi, there! I'm Grystal Collins, and I'm very happy to share some time with you. So, you want to keep fit, huh? Well, you surely came to the right place. Together we can keep fit and healthy, and succeed in doing that. It's easy. Everybody can do it, you hear? Just remember the five golden rules.
Number one: Always wear comfortable clothes when you are exercising. You need to feel comfortable and relaxed（放松）.
Number two: You should always do some warming-up exercise first to get your body ready for the real thing.
Number three: Never try to do too much exercise too soon. Take it nice and easy now, you hear? There's no rush about this.
Number four: Don't forget to relax for about five minutes when you've finished your exercise. You need to rest a little bit after you've been exercising.
And here is the golden rule Number five. Stop at once if you feel any pain in your neck, head or any part of your body.
The students may most probably be the people ___________.

A．who are ill

B．who want to be healthier

C．who are Crystal Collins' good friends

D．who are not interested in taking exercise

Crystal Collins may most probably say this            .

A．before the exercise starts

B．when the exercise is over

C．during the exercise

D．as soon as the exercise has started

Which of the following is NOT true?

A．You should do some warming-up exercise before the real thing.

B．You should wear comfortable clothes.

C．You should rest for a while when you are doing warming-up exercise.

D．You should stop if you feel any pain in your body.