He looked________，but the faint pulse proved that he was still________.

A. die;  live　　　　   B. death; life　　　　  C. dead;  alive　　　　　　  D. deadly;  lively

Nowadays more and more people are interested in aerobic(adj. 健身操) exercises. There are many such programs on TV or you can just go to a club to learn the exercises. But here is some advice for you to follow once you decide to take them up or are just about to start.

First, get your doctor's permission to start an aerobic exercise program. He or she will check your physical condition and tell you whether it's safe to start exercising.

Make sure that each time you start with a warm-up period. You should stretch（伸展）your muscles and get them ready for your workout. Warm up for at least five minutes.

Then start actual training. Jog, bike, or do exercises that get your heart rate up to the target range. Depending on your age and your physical condition, aim to raise your pulse rate to be to between 140 and 160 beats per minute. Take your pulse during exercises to make sure that your heart rate doesn't get too fast. After the 20-minute aerobic exercises, start cooling down. Do a few gentle stretches while you catch your breath. If your heart rate does not return to a resting rate (about 70) within five minutes, you're working out too hard. Finally, during the recovery period, sit down and relax. The following graph（图表）will help you to learn about the safe pulse rate in each period.

68. You should 　　　　 before you start an aerobic exercise program.

A. make sure that you are young enough

B. make sure that you have learned warm-up exercises

C. go to a doctor for a medical examination

D. learn a course of aerobic exercises on TV

69. What should your pulse rate be at the beginning of the cool-down period?

A. Around 70 beats.　　　　 　　B. Around 90 beats.

C. Around 130 beats. 　　　　　　　　　 D. Around 150 beats.

70. The warm-up period should last at least　　　　 .

A. 5 minutes 　　　　 B. 10 minutes 　 C. 15 minutes　 　 D. 20 minutes

　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

　　● Want to keep abreast (赶得上) of the dynamic (有力的) pulse of China's economy?

　　● Get a glimpse of the most important business activities taking place every day through Business Daily Update, a service offered by China Daily Information via (经由) the World Wide Web.

　　● Placed under 10 categories , over 25 news items appear each day with the top three events highlighted, all in English. Business Daily Update is just a few mouse clicks away.

　　●Subscribe to BDU for an annual fee of US 240．Email and fax services are also available upon request.

　　●For more information, please contact Business Daily Update:

　　Tel:(010) 64941107,(010)64924488 ext . 20000;

　　Fax : 86-10-64941125 ;

　　Email : bdu@ chinadaily. com . cn ; URL ; http : // www. chinadaily. com. cn/bdu

1．If you get into BDU , you can ________ .

[　　]

A．know everything in China

B．get the most important business information in the world

C．get the information of the latest business activities taking place in China

D．get all the information in China Daily

2．This ad will be very helpful to ________ .

[　　]

3．To get the information from BDU every day, you must ________ .

[　　]

A．understand Chinese

B．know something about the mouse

C．know how to operate a computer

D．how to use a fax machine

4．If you have www. chinadaily. com. cn / bdu, you can get in touch with BDU by ________ .

[　　]

A. die;  live　　　　   B. death; life　　　　  C. dead;  alive　　　　　　  D. deadly;  lively