A Brown University sleep researcher has some advice for people who run high schools: Don’t start classes so early in the morning. It may not be that the students who nod off at their desks are lazy. And it may not be that their parents have failed to enforce (确保) bedtime. Instead, it may be that biologically these sleepyhead students aren’t used to the early hour.

“Maybe these kids are being asked to rise at the wrong time for their bodies,” says Mary Carskadon, a professor looking at problem of adolescent  (青春期的) sleep at Brown’s School of Medicine.

Carskadon is trying to understand more about the effects of early school time in adolescents. And, at a more basic level. she and her team are trying to learn more about how the biological changes of adolescence affect sleep needs and patterns.

Carskadon says her work suggests that adolescents may need more sleep than they did at childhood, no less, as commonly thought.

Sleep patterns change during adolescence, as any parent of an adolescent can prove. Most adolescents prefer to stay up later at nigh and sleep later in the morning. But it’s not just a matter of choice –their bodies are going through a change of sleep patters.

All of this makes the transfer from middle school to high school—which may start one hour earlier in the morning  ---- all the more difficult , Carskadon says. With their increased need for sleep and their biological clocks set on the “sleep late, rise late” pattern, adolescent are up against difficulties when it conics to trying to be up by 5 or 6 a.m. for a 7:30 a.m. first hell. A short sleep on a desktop may be their body’s way of saying. “I need a timeout.”

Carskadon suggests that high schools should not start classes so early in the morning because ________.

A. it is really tough for parents to enforce bedtime

B. it is biologically difficult for students to rise early

C. students work so late at night that they can’t get up early

D. students are so lazy that they don’t like to go to school early

The underlined phrase “nod off” most probably means “ _______”.

A. turn around    B. agree with others  C. fall asleep  D. refuse to work

What might be a reason for the hard transfer from middle school to high school?

A. Adolescents depend more on their parents.

B. Adolescents have to choose their sleep patterns.

C. Adolescents sleep better than they did at childhood.

D. Adolescents need more sleep than they used to.

What is the test mainly about?

A. Adolescent heath care.      B. Problems in adolescent learning.

C. Adolescent sleep difficulties.   D. Changes in adolescent sleep needs and patterns.

People who are outdoors in cold weather should avoid actions like suddenly lifting a heavy basket full of snow. Even walking through heavy, wet snow can strain a person’s heart.
Many people aren’t conditioned to the physical stress of outdoor activities and don’t know the dangers of being outdoors in cold weather. Those who like winter sports can suffer accidental hypothermia if they don’t make certain preparations.
Hypothermia means the body temperature has fallen below normal. It occurs when your body can’t produce enough energy to keep the internal (内部的) body temperature warm enough. It can kill you. Heart failure causes most deaths in hypothermia.
Children, the elderly and those with heart disease are at special risk. As people age, their ability to keep a normal internal body temperature often decreases. Elderly people can suffer hypothermia without knowing they’re in danger because they can’t notice the cold conditions as quickly as the young.
Besides cold temperatures, high winds,  snow and rain can also steal body heat. Wind is especially dangerous because it removes the layer of heated air from around your body. At 30 degrees Fahrenheit in a 20-mile-per-hour wind, the cooling effect is equal to calm air at four degrees. Similarly dampness (湿气) causes the body to lose heat faster than it would at the same temperature in drier conditions.
To keep warm, wear more clothes. This traps air between layers. Also, wear a hat or head scarf. Much of your body’s heat can be lost through your head. Keep your hands and feet warm, too, as they tend to lose heat rapidly.
Don’t drink alcohol before going outdoors or when outside. Alcohol makes you feel warm at first because blood vessels in the skin expand. But heat is then drawn away from the body’s important organs.
【小题1】The underlined word “strain” in Paragraph 1 means ________.

A.injureB.warmC.controlD.burn
【小题2】What is implied in the passage about hypothermia?
A.It means the body temperature falls rapidly.B.Most heart attacks are caused by it.
C.It is not as scary as people think.D.It can threaten a person’s life.
【小题3】 Based on the passage, one of the reasons why the elderly are at special risk of suffering from hypothermia is that _______.
A.they like exercising outside in cold mornings
B.they can’t notice cold conditions if they are not told
C.their body temperature is generally lower than young people’s
D.their ability to keep a normal internal body temperature is not so good
【小题4】What is Paragraph 5 mainly about?
A.What causes the body to lose heat faster.B.The advantages of drier conditions.
C.What else can steal body heat.D.Dangers of high winds.
【小题5】Which of the following is NOT a result of drinking alcohol before going outdoors?
A.Feeling warm at firstB.The body’s heat is taken away
C.Blood vessels in the skin expandD.The risk of hypothermia is reduced

.

第二节:完形填空(兆20小题;每小题1分,满分20分)

阅读下面短文,掌握其大意,然后从21-40各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答卷纸上将该选项标号涂黑。

Temperature is part of my married romance Coming to New’York from Baltimore-where there is just one small snowstorm each year-1was  21  by a fireplace in my new home,wit fires  22  all day,just as what ancient people did at a wedding.

My husband,Peter,comes from northem Ontario,where winter  23  from September to May and cold wind is  24 .”When Canadians have 30 below,they  25  it,”he says.“Cold wind is for crybabies.”

So to marry this man I had to learn to  26  for serious cold. To get me from Baltimore's Inner Harbor to Albany’s frozen Hudson,Peter piled me  27  jackets and sweaters,scarves and gloves.even a hat with earflaps.The gift of Sorel boots-comfortably warm at Canada’s 30 below,was a  28  we were getting serious.

That first winter together,living in upstate New York,I thought I’d  29  My boots were good below freezing,but my fingers could  30  tie them.Physical adaptation is real,but it came slowly.And there is also emotional  31  to cold.Some days I tell myself that I have enough beach memories to stick to on  32  days and other days I am reminded that living cold does indeed build  33 .

34 ,having a warm house is important.After my first marriage ended,for years I 35   ! went on a second date with a man whose response to my”I'm cold”was.”Put on a sweater.”Now I’m married to a man who  36  that cold hands do not mean a warm heart.And that a big oil bill is better than roses But surprisingly,I've grown,too.I am  37 ,in this new life and climate,to go look for that cost-saving sweater.

The word comfortable did not  38  refer to being contented.Its Latin root,comfortare, means to strengthen.The Holy Spirit is Comforter;not to make us comfortable,but to make us

39 .we  40  not be warm but we are indeed comforted.

21.A.set down          B.set about          C.set up          D.set out

22.A.lighting           B.burning            C.going           D.flashing

23.A.appears           B.starts             C.keeps           D.runs

24.A.something         B.everything        C.nothing         D.none

25.A.suggest           B.mean              C.overlook        D.enjoy

26.A.wear             B.stand              C.dress          D.ride

27.A  under            B.over               C.inside          D.with

28.A.remark           B.sign               C.warning        D.show

29.A.sleep             B.forget             C.die            D.continue

30.A.hardly            B.easily             C.tightly          D.loosely

31.A.health            B.reaction          C.feelings         D.adaptation

32.A.rainy             B.freezing           C.sunny          D.happy

33.A.character         B.love              C.hope           D.hardship

34.A.Meanwhile        B.However          C.Therefore       D.Besides

35.A.merely            B.ever             C.never           D.just

36.A.wonders          B.knows            C.states           D decides

37.A.unable            B.accustomed       C.interested       D.willing

38.A.originally          B.exactly           C.actually         D.namely

39.A.wild              B.cold              C.strong          D.warm

40.A.will              B.must              C.can            D.may

 

 People who are outdoors in cold weather should avoid actions like suddenly lifting a heavy basket full of snow. Even walking through heavy, wet snow can strain a person’s heart.

Many people aren’t conditioned to the physical stress of outdoor activities and don’t know the dangers of being outdoors in cold weather. Those who like winter sports can suffer accidental hypothermia if they don’t make certain preparations.

Hypothermia means the body temperature has fallen below normal. It occurs when your body can’t produce enough energy to keep the internal (内部的) body temperature warm enough. It can kill you. Heart failure causes most deaths in hypothermia.

Children, the elderly and those with heart disease are at special risk. As people age, their ability to keep a normal internal body temperature often decreases. Elderly people can suffer hypothermia without knowing they’re in danger because they can’t notice the cold conditions as quickly as the young.

Besides cold temperatures, high winds,  snow and rain can also steal body heat. Wind is especially dangerous because it removes the layer of heated air from around your body. At 30 degrees Fahrenheit in a 20-mile-per-hour wind, the cooling effect is equal to calm air at four degrees. Similarly dampness (湿气) causes the body to lose heat faster than it would at the same temperature in drier conditions.

To keep warm, wear more clothes. This traps air between layers. Also, wear a hat or head scarf. Much of your body’s heat can be lost through your head. Keep your hands and feet warm, too, as they tend to lose heat rapidly.

Don’t drink alcohol before going outdoors or when outside. Alcohol makes you feel warm at first because blood vessels in the skin expand. But heat is then drawn away from the body’s important organs.

1.The underlined word “strain” in Paragraph 1 means ________.

A. injure       B. warm         C. control          D. burn

2.What is implied in the passage about hypothermia?

A. It means the body temperature falls rapidly.  B. Most heart attacks are caused by it.

C. It is not as scary as people think.          D. It can threaten a person’s life.

3. Based on the passage, one of the reasons why the elderly are at special risk of suffering from hypothermia is that _______.

A. they like exercising outside in cold mornings

B. they can’t notice cold conditions if they are not told

C. their body temperature is generally lower than young people’s

D. their ability to keep a normal internal body temperature is not so good

4.What is Paragraph 5 mainly about?

A. What causes the body to lose heat faster.  B. The advantages of drier conditions.

C. What else can steal body heat.          D. Dangers of high winds.

5.Which of the following is NOT a result of drinking alcohol before going outdoors?

A. Feeling warm at first             B. The body’s heat is taken away

C. Blood vessels in the skin expand   D. The risk of hypothermia is reduced

 

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