A．集线器B．协议转换器C．网桥D．路由器E．网关

Taking more exercise will prevent you _______weight.

A．to put up

B．putting up

C．to put on

D．putting on

Taking more exercise will prevent you ______ weight.

A．to put up

B．putting up

C．to put on

D．putting on

Taking more exercise will prevent you ______ weight.

A．to put up

B．putting up

C．to put on

D．putting on

Taking more exercise will prevent you _______weight.

A. to put up

B. putting up

C. to put on

D. putting on

A、was more common in the past than it is today

B、can be avoided if you’re careful

C、is very likely to happen to you

D、only happens to people who use computers

Question 28to 31are based on the following passage. 

Regular exercise can help you build stronger muscles, shake off illnesses？and make your clothes fit a whole lot better. But there’sanother benefit:even moderate exercise www.docin.com 10 seems to take years off your age. Of course, you cant change your age, but exercise can improve your health so that you look and feel younger than you are. 

Exercise gives you more energy. Exercise fires up your brain and body so you feel more energetic. 

Exercise puts your body in a state of excitement,which means more vitality and a greater sense of well being. Daily tasks become less tiring and require less effort. It’s the kind of energy that makes you feel like you are a decade or two younger. 

Exercise keeps your skin soft and glowing. Researchers studied a small group of adults between ages 20and 84. The frequent exercisers who were over age 40had skin that resembled the younger skin of people in their 20s and 30s. The difference had nothing to do with sun exposure, which would age your skin faster, reported the research team, they guess that exercise creates body substances that help slow aging in skin, though they say more research is needed to learn how exercise works. 

Moreover,exercise helps you sleep soundly. Restful sleep is like a fountain of youth, and exercise helps you achieve it. Research shows that regular exercisers fall asleep more easily and are more likely to 7experience deep sleep. Exercise tires you out,sure,but there’s v more to it than that. Sleeping well helps all the systems in your body function optimally,so d you’re less likely to suffer sleeplessness. A recent study finds that getting at least 150minutes of exercise per week improves sleep quality by 65%. 

28.What do we know about sun exposure according to the passage？

A.It leads to faster aging in skin

B.It encourages more exercise

C.It makes the exerciser sweat

D.It creates body substances

What can we learn from Para, 3？ A.The researchers think exercise helps the skin work faster 

B.The researchers are not sure how exercise works on skin 

C.Exercise brings more sun exposure to the skin 

D.Exercise only works on people under 40 

How does exercise affect people’s sleep？ A.It improves sleep quality

B.It increases the length of sleep 

C.It helps people sleep regularly

D.It makes people less tired in sleep 

Which would be the best title of the passage？ A.Exercise and Sounder Sleep

B.Exercise and Stronger Muscles 

C.Exercise Increases Sun Exposure

D.Exercise Makes You Look Younger

请帮忙给出每个问题的正确答案和分析，谢谢！

What idea does the writer try to get across？

A．The more research you do, the more familiar you are on a topic.

B．The more essays you write, the more likely you become an expert.

C．The more judgements you make, the more likely you will be rewarded.

D．The more materials you collect, the less likely you will be an expert.