15.Parents whose children show a special interest in a sport feel very difficult to make a decision about their children's careers.Should they allow their children to train to become top sports men or women?For many children it means starting schoolwork very young,and going out with friends and other interests have to take a second place.It's very difficult to explain to a young child why he or she has to train five hours a day,even at the weekend,when most of his or her friends are playing.
Another problem is of course money.In many countries money for training is available from government for the best young sportsmen and women.If this help can not be given,it means that it is the parents who have to find the time and the money to support their child's development and sports clothes,transport to competitions,special equipment,etc.
Many parents are worried that it is dangerous to start serious training in a sport at an early age.Some doctors agree that young muscles may be damaged by training before they are properly developed.Professional ( 专业的) trainers however,believe that it is only by training young that you can reach the top as a successful sports person.It is clear that very few people do reach the top,and both parents and children should be prepared for failure even after many years of training.
52.This article is probably taken fromD.
A.a letter                      
B.an advertisement
C.a personal diary               
D.a newspaper article
53.According to the passage parents whose children show a special interest in sport
A.
A.feel uncertain if they should let their children train to be sportsmen or women
B.try to get financial support from the government for their children's training
C.have to get medical advice from doctors about training methods
D.prefer their children to be trained as young as possible
54.Which of the following statements is NOT true?C
A.It's hard for a young child to understand why he or she has to spend so much time training.
B.Early training may damage their muscles.
C.Most children may become professional sports men or women after a long period of training.
D.It's very expensive for parents to support their child's development in sports.
55.The underlined phrase"to take a second place"meansB.
A.to repeat the activities some other day
B.to become less important
C.to be of no importance
D.to happen again.
14.When building houses,people used to think about not only the climate of the areas but also the buiding materials and the fashions for their houses.However since electricity became more and more expensive,people began to pay much more attention to the energy they could get for their houses and the new ways they could find to protect their house from both cold and heat.
Now,houses of an old yet new type have been widely built.In some parts of the world,people share their houses with their livestock (家禽).During cold weather,they gather their cows,goats,or other animals and keep them on the first floor of their houses.The reasons are that the animals can be protected from the cold and that they can help to heat the houses as well.The body heat given off by the animals rises to the second floor of the houses,where people live.By sharing their houses with their livestock,people gain a source of heat.
People who live in or near cities do not usually keep livestock.However,home builders use the fact that heat rises.This naturallaw can be used in building houses in these areas.Instead of keeping livestock on the first floor,builders fill it with large rocks.As they are open to the sun's rays during cold weather,these rocks take in heat.They also give off the heat,and,of course,the warm air rises into the living areas of the houses.So these houses are energy-saving.
House-building becomes a great challenge to building designers and energy engineers.They try to meet this challenge by learning from old traditions and by using modern technology.And someday in the future,people will be able to live in more energy-saving houses.

44.What did people begin to consider as electricity was no longer cheap?B
A.The climate of their areas.
B.The energy for their houses.
C.The fashions for their houses.
D.The building materials for their houses.
45.People in some areas gain a source of heat byA?
A.keeping their livestock downstairs
B.protecting their livestock from the cold
C.sharing their houses only with their cows
D.living on the second floor with their livestock
46.The underlined words"natural law"in the third paragraph refer to the fact thatB
A.heat raises the temperature in the houses.
B.heat goes in the upward direction.
C.heat goes up if temperature is raised.
D.heat increases the temperature of rocks.
47.From the passage,we can conclude thatB.
A.people will no longer consider building materials in the future.
B.energy-saving buildings will become more popular in the future.
C.almost all people will move into the houses heated by large rocks.
D.energy engineers will devote themselves only to modern technology.
10.Science can't explain the power of pets,but many studies have shown that the company of pets can help lower blood pressure (血压) and raise ch ances of recovering from a heart attack,reduce loneliness and spread all-round good cheer.
Any owner will tell you how much joy a pet brings.For some,an animal provides more comfort than a husband/wife.A 2002 study by Karen Allen of the State University of New York measured stress (紧张) levels and blood pressure in people-half of them pet owners-while they performed 5 minutes of mental arithmetic (算术) or held a hand in ice water.Subjects completed the tasks alone,with a husband/wife,a close friend or with a pet.People with pets did it best.Those tested with their animal friends had smaller change in blood pressure and returned most quickly to baseline heart rates.With pets in the room,people also made fewer math mistakes than when doing in front of other companions.It seems people feel more relaxed (放松)around pets,says Allen,who thinks it may be because pets don't judge.
A study reported last fall suggests that having a pet dog not only raises your spirits but may also have an effect on your eating habits.Researchers at Northwestern Memorial Hospital spent a year studying 36 fat people and their equally fat dogs on diet-and-exercise programs; a separate group of 56 people without pets were put on a diet program.On average,people lost about 11 pounds,or 5% of their body weight.Their dogs did even better,losing an average of 12 pounds,more than 15% of their body weight.Dog owners didn't lose any more weight than those without dogs but,say r esearchers,got more exercise overall-mostly with their dogs-and found it worth d oing.
29.What does the text mainly discuss?A
A.What pets bring to their owners.
B.How pets help people calm down.
C.People's opinions of keeping pets.
D.Pet's value in medical research.
30.We learn from the text that a person with heart disease has a better chance of getting well ifB.
A.he has a pet companion
B.he has less stress of work
C.he often does mental arithmetic
D.he is taken care of by his family
31.According to Allen,why did the people do better with pets around when completing stressful tasks?C
A.They have lower blood pressure.
B.They become more patient.
C.They are less nervous.
D.They are in higher spirits.
32.The research mentioned in the last paragraph reports thatA.
A.people with dogs did more exercise
B.dogs lost the same weight as people did
C.dogs liked exercise much more than people did
D.people without dogs found the program unhelpful.
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