Can you remember a morning when you’ve woken up to the ring of your alarm clock and wished you could stay in bed? You haven’t slept well, your hair is a mess. Worse, you can’t stop yawning. Yawning is universal to humans and many animals. Cats, dogs and fish yawn just like humans do! Yawning is an involuntary(无意识的,不自觉的) action during which you open your mouth and breathe deeply. The average duration of a yawn is about 6 seconds.
The purpose and cause of yawning are still a mystery. Scientists are not sure what causes a yawn. People yawn when they are tired or bored, but they also yawn when they aren’t. There are many ideas explaining why we yawn.
One idea is that yawning is a way for the body to become more alert by taking in more oxygen. A yawn increases the heart rate, forces carbon dioxide out of the lungs and blood stream, and brings oxygen to the brain. But one study showed that volunteers given a lot of oxygen did not yawn any less than before, while those given a lot of carbon dioxide did not yawn more.
Another idea is that early humans used yawning as a form of communication. If one decided it was time to sleep, they would tell the others by yawning and they would do it in return to show they agreed.
A third explanation comes from psychology professor Gordon Gallup of University at Albany in New York. He said that as people yawn, they cool off their brains. “Brains are like computers.” he said. “They only operate efficiently and effectively when they’re cool. Many things connected to yawning, like being tired, make the brain hot, and yawning can reduce the heat.”
Scientists have sent people into space, and created terrible nuclear weapons, but there are lots of seemingly simple things, such as why we yawn, or hiccup（打嗝）, that they can’t figure out. Next time you are in class in the morning, let out a big yawn and watch to see how many of your classmates yawn in response!
【小题1】What’s the purpose of the description of how bad you may feel when you’re woken up in the morning?

VI. 短文改错

找出下面一段文章中的错处并改正。如该行缺一词，在文中缺词处标上“  ”  ，并在相应的横线上写上正确的词语；如该行多一词，在文中用斜线划掉多余的词，并在相应的横线上写上该词，用斜线划去；如该行错一词，在文中用横线标出，再在相应的横线上写上正确的词语。如该行无错，在相应的横线上打上“  ” 。

示例：

Betty wants to be  nurse and works with sick people        a       

who need her helps.                                 help     

Last summer Betty  had  broke her leg.                had     

The pain was very great and she couldn’t walk.                    

  The telephone rang and I picked out the receiver(话筒). “Hello,”   69.____________

I said.  “Hello,” said the voice. “Bill here, is Betty there?”         70.____________

“I’m sorry,” I said, “You have got the wrong number.”             71.____________

A few seconds late, the telephone rang again. Just                 72.____________

as I expected he was Bill, “You have made a mistake again.”        73.____________

I explained. The telephone rang a third time. This made I           74.____________

angry. I speak in a big voice, “Hello, Bill, Betty here.”             75._____________

For a moment there was a dead silent. Then someone said,         76._____________

“What’s the wrong with you, Tom?” It was my mother.            77._____________

I could do anything but say sorry to my mother.                  78_____________

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 .

It is not unusual to see your desk-mate yawn (打呵欠) as he complains that he didn't have a good sleep the night before. Many teens don't get enough sleep because they have too much homework, which keeps them up at night. Some teens cannot sleep at night even when they want to.

Studies show that during your teenage years, the body's biological clock is reset, telling you to sleep later at night and wake up later in the morning.

But changes in the body clock aren't the only reason teens lose sleep. Lots of people have insomnia (失眠). The most common cause of insomnia is stress. But all sorts of things can lead to insomnia. These include physical discomfort, emotional troubles and even sleeping environment. It's common for everyone to have insomnia from time to time. But if it lasts for a month or more go and see a doctor.

Some people have a condition that causes stomach acid (酸) to move backward towards the chest. This produces the uncomfortable, burning feeling called heartburn. So even if the person doesn't notice the feelings of heartburn because he is sleeping, he may feel tired the next day.

Most teens have nightmares sometimes. But, if they are frequent, a person's sleep pattern can be seriously affected. The most common cause of nightmares is emotional problems, such as stress (压力) or anxiety. If you have them a lot, it's a good idea to talk to a doctor.

Doctors encourage teens to make lifestyle changes to develop good sleeping habits. You probably know that coffee can keep you awake, but did you know that playing video games or watching TV does the same?

1. The main idea of the first paragraph is ________.

A. There is a problem that teenagers can’t get enough sleep.

B. Sleeping problems have different causes.

C. Yawning is a good way to get rid of sleep.

D. Teenagers care too much for homework.

2. The Teenagers’ biological clock ________.

A. easily makes teenagers lead to insomnia

B. is the origin of their insomnia

C. provides them with plenty of time at night

D. is helpful to improve their concentration(注意力)

3. What does the writer say about “nightmares”?

A. It is nothing and shouldn’t be taken seriously.

B. It can release their stress or anxiety.

C. Emotional problems are the only way to form nightmares.

D. People will suffer from sleep if frequent.

4. Which way can help to get rid of insomnia?

A. Drinking some coffee before going to bed.

B. Playing video game or watching TV from time to time.

C. Turning to a doctor for help.

D. Eating much medicine for insomnia.

It is not unusual to see your desk-mate yawn (打呵欠) as he complains that he didn't have a good sleep the night before. Many teens don't get enough sleep because they have too much homework, which keeps them up at night. Some teens cannot sleep at night even when they want to.

Studies show that during your teenage years, the body's biological clock is reset, telling you to sleep later at night and wake up later in the morning.

But changes in the body clock aren't the only reason teens lose sleep. Lots of people have insomnia (失眠). The most common cause of insomnia is stress. But all sorts of things can lead to insomnia. These include physical discomfort, emotional troubles and even sleeping environment. It's common for everyone to have insomnia from time to time. But if it lasts for a month or more go and see a doctor.

Some people have a condition that causes stomach acid (酸) to move backward towards the chest. This produces the uncomfortable, burning feeling called heartburn. So even if the person doesn't notice the feelings of heartburn because he is sleeping, he may feel tired the next day.

Most teens have nightmares sometimes. But, if they are frequent, a person's sleep pattern can be seriously affected. The most common cause of nightmares is emotional problems, such as stress (压力) or anxiety. If you have them a lot, it's a good idea to talk to a doctor.

Doctors encourage teens to make lifestyle changes to develop good sleeping habits. You probably know that coffee can keep you awake, but did you know that playing video games or watching TV does the same?

1.The main idea of the first paragraph is ________.

A. There is a problem that teenagers can’t get enough sleep.

B. Sleeping problems have different causes.

C. Yawning is a good way to get rid of sleep.

D. Teenagers care too much for homework.

2.The Teenagers’ biological clock ________.

A. easily makes teenagers lead to insomnia

B. is the origin of their insomnia

C. provides them with plenty of time at night

D. is helpful to improve their concentration(注意力)

3.What does the writer say about “nightmares”?

A. It is nothing and shouldn’t be taken seriously.

B. It can release their stress or anxiety.

C. Emotional problems are the only way to form nightmares.

D. People will suffer from sleep if frequent.

4.Which way can help to get rid of insomnia?

A. Drinking some coffee before going to bed.

B. Playing video game or watching TV from time to time.

C. Turning to a doctor for help.

D. Eating much medicine for insomnia.