What do you do if you are hit in the mouth and one of your teeth is knocked out? A dentist(牙医)may be able to put the tooth back in for you, but you have to get to the dentist first．In the meantime, you have to store the tooth so that it will stay healthy．

The simplest thing to do is put the tooth back into your mouth, or you could put it in milk．Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth．He tried putting teeth into milk, into water, and into cell-culture medium(细胞培养液)．He also tried, just drying the teeth in the open air．He used teeth that had to be removed from people’s mouths for various reasons．The teeth were put into one of the solutions(溶液)or stored in the air for one hour．Then cells from the root of the teeth were scraped-off the teeth．Dr．Courts and the others then studied how healthy these cells were．

The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth．However, few people keep cell-culture medium handy at home or in school．

The next best thing was milk．But Dr．Courts said that the best thing of all was to wash the tooth and put it right back into its socket(牙槽)in the mouth．For some people, though, this is just too painful or upsetting．So milk will do, until you get your tooth (and your mouth)to a dentist．

This passage is mainly about              ．

A. how a dentist can save a knocked-out tooth

B. how to keep a knocked-out tooth healthy

C．how Dr．Courts and other researchers made their experiments

D．how to put a knocked-out tooth back into its socket

The best way to keep a knocked-out tooth healthy outside the mouth is to store it       .

A．in cell-culture medium    B．in milk     C．in water    D．in the open air

Milk can be used instead of cell-culture medium to put a knocked-out tooth in because     ．

A．milk works better to keep the tooth healthy  B．milk causes less pain

C．cell-culture medium is not usually handy    D．cell-culture medium is more expensive

“Dr．Courts said that the best of al1 was to wash the tooth and put it right back into its socket in the mouth．”In the sentence, the word “best” means              .

A．cheapest and healthiest                  B．least painful and cheapest

C．quickest and least painful                D．easiest and healthiest

Can you imagine that you can save your own life during a heart attack(心脏病发作) by coughing(咳嗽)? Let’s see how…

A heart attack can happen to anyone. Let’s say it’s 4:17 p.m. and you’re driving home (alone of course) after an unusually hard day on the job. Not only was the workload(工作负担) extremely heavy, you also had a disagreement with your boss, and no matter how hard you tried, he just wouldn’t see your side of the situation. You’re really upset and the more you think about it, the more nervous you become.

All of a sudden you start experiencing severe pain in your chest that starts to spread out into your arm and up into your jaw（下巴）. You are only about five miles from the hospital nearest your home, unfortunately you don’t know if you’ll be able to make it that far.

What can you do? You’ve been trained in CPR but the guy who taught the course didn’t tell you how to perform it on yourself.

Since many people are alone when they suffer a heart attack, this article seems in order. Without help the person whose heart stops beating properly and who begins to feel faint（晕眩的）has only about 10 seconds left before losing consciousness. However, these victims can help themselves by coughing repeatedly and very powerfully. A deep breath should be taken before each cough, and the cough must be deep and last long, as when producing sputum（痰）from deep inside the chest. A breath and a cough must be repeated about every two seconds without stopping until help arrives, or until the heart is felt to be beating normally again. Deep breaths get oxygen into the lungs（肺）and coughing movements squeeze(挤压) the heart and keep the blood circulating.

The squeezing pressure on the heart also helps it regain normal rhythm(节奏). In this way, heart attack victims can get to a phone and, between breaths, call for help.

Now, do you understand the whole matter? Tell as many other people as possible about this. It could save their lives!

According to the passage, CPR is most probably something done to       .

A. regain someone’s breath and heart beat  

B. help someone treat a heart attack by himself

C. teach people how to stay in good state  

D. train people how to stay calm when facing dangers

According to Paragraph 5, coughing during a heart attack helps        .

A. to relax the heart                     B. to get oxygen into the lungs

C. to keep the blood circulating            D. to reduce the pain in the chest

We can learn from the passage that          .

A. a long day’s work usually results in heart attacks  

B. not only the chest aches when one suffers a heart attack  

C. people should attend a CPR course to survive heart attacks

D. one should cough loudly immediately one’s chest aches

In which section of a newspaper can you read this passage?

A. Health Care        B. Advertisement.        C. Family.         D. Teaching.

Do you find getting up in the morning so difficult that it’s painful? This might be called laziness, but Dr. Kleitman has a new ___36____. He has proved that everyone has a daily energy cycle.
During the hours when you labour through your work, you __37___ say that you’re “hot”. That’s true. The time of day when you feel most energetic is when your cycle of body temperature is ___38____. For some people the peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered __39___ this is so , but it leads to such familiar monologues （自言自语）__40___ “Get up , John ! You’ll be late for work again!” The ___41___ explanation to the trouble is that John is at his temperature—and —energy peak in the evening. Much family quarrelling ___42___ when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.
You can’t change your ___43___, but you can make your life ___44___ it better. Habit can help. Dr. Kleitman believes. Maybe you’re sleepy in the evening but feel you must stay up late ___45___. Counteract （打乱）your cycle to some extent by ___46___ staying up later than you want to . If your energy is ___47___ in the morning but you have an important job to do early in the day, ___48___ before your usual hour. This won’t change your cycle, but you’ll get up steam(打起精神) and work better ___49___.
Get off to a slow start ___50___ saves your energy. Get up with a yawn （呵欠）and ___51___ . Sit on the edge of the bed a minute before ___52____ on the floor. Avoid the ___53___ search for clean clothes by laying them out ___54___. Whenever possible , do routine （常规的）work in the afternoon and save tasks ___55____ more energy for your sharper hours .

What do you do if you are hit in the mouth and one of your teeth is knocked out? A dentist(牙医)may be able to put the tooth back in for you, but you have to get to the dentist first．In the meantime, you have to store the tooth so that it will stay healthy．
The simplest thing to do is put the tooth back into your mouth, or you could put it in milk．Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth．He tried putting teeth into milk, into water, and into cell-culture medium(细胞培养液)．He also tried, just drying the teeth in the open air．He used teeth that had to be removed from people’s mouths for various reasons．The teeth were put into one of the solutions(溶液)or stored in the air for one hour．Then cells from the root of the teeth were scraped-off the teeth．Dr．Courts and the others then studied how healthy these cells were．
The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth．However, few people keep cell-culture medium handy at home or in school．
The next best thing was milk．But Dr．Courts said that the best thing of all was to wash the tooth and put it right back into its socket(牙槽)in the mouth．For some people, though, this is just too painful or upsetting．So milk will do, until you get your tooth (and your mouth)to a dentist．
【小题1】This passage is mainly about             ．

Do you find getting up in the morning so difficult that it’s painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle.

During the hours when you labour through your work, you may say that you’re “hot”. That’s true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people that peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues （自言自语）as “Get up , John ! You’ll be late for work again !” The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.

You can’t change your energy cycle, but you can make your life fit it better. Habit can help. Dr. Kleitman believes. Maybe you’re sleepy in the evening but feel you must stay up late anyway. Counteract your cycle to some extent by habitually staying up later than you want to . If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour. This won’t change your cycle , but you’ll get up steam and work better at your low point .

Get off to a slow start which saves your energy. Get up with a yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiring more energy for your sharper hours .

1.If you want to work better at your low point in the morning, you should ??? .

A. change your energy cycle ????????????? ????????????? B. overcome your laziness

C. get up early than usual ????????????? ????????????? D. go to bed earlier

2.You are advised to rise with a yawn and stretch because it will ?????? .

A. help to keep your energy for the day’s work

B. help you to control your temper early in the day

C. enable you to get your energy on your routine work

D. keep your energy cycle under control all day

3.What’s the best title of the passage?

A. Change Your Habits ????????????? ????????????? B. Save Your Energy

C. Daily Energy Cycle ????????????? ????????????? D. Temperature-and-Energy Peak

4.The text is probably taken from a ______.

A. news report?????????????????????? B. research paper?

C. medical textbook?????????????????? D. fashion journal