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Most people regard zoos as safe places for animals, where struggles such as difficulty finding food and avoiding predators（捕食性动物） don't exist. Without such problems, animals in zoos should live to a ripe old age. But that may not be true for the largest land animals on Earth. Scientists have known that elephants in zoos often develop diseases, joint problems and behavior changes. Sometimes, they even become unable to have babies.

To learn more about how captivity(监禁) affects elephants, a team of international scientists led by Mason, a biologist, compared the life spans of female elephants born in zoos with female elephants living outdoors in the wild. Zoos keep detailed records of all the animals in their care, documenting factors such as birth dates, illnesses, weight and death. These records made it possible for the researchers to analyze 40 years of data on 800 elephants in zoos.

The team found that female elephants born in zoos lived an average of 16.9 years. Their wild counterparts（同类事物） who died of natural causes lived an average of 56 years——more than three times as long.

Scientists don't yet know for sure why wild elephants seem to live so much better than their zoo-raised counterparts. Mason thinks stress and obesity(肥胖) may be to blame. Zoo elephants don't get the same kind of exercise as they do in the wild, and most are very fat. Elephant social lives are also much different in zoos than in the wild, where they live in large groups.

Another finding from the study showed that elephants born in zoos were more likely to die earlier than elephants captured in the wild and brought to zoos. Mason suggests stress in the mothers in zoos might cause them to have babies that are less likely to survive.

The study raises some questions about acquiring more elephants to keep in zoos. While some threatened and endangered species living in zoos reproduce successfully and keep healthy populations, that doesn't appear to be the case with elephants.

1.The text tells us that zoo elephants are different from other zoo animals because they________

2.What do the scientists find in their research?

3.Which of the following does the author suggest in the last paragraph?

4.Which of the following can be the best title?

The effects of air pollution on natural conditions have been a disturbing problem for many years. Some scientists hold the view that the air inside houses may be more dangerous than the air outside. It may even be one hundred times worse.

Most scientists agree that every modern house has some kind of indoor pollution, which can cause a person to feel tired, to suffer eye pain, headache and other problems. Believe it or not, some pollutants can cause breathing diseases of blood and even cancer.

What made us feel relieved is that there’s growing concern about the problem now. It is true that when builders began constructing houses and offices they did not want to waste energy. To do this they built buildings that prevented or limited the flow of air between inside and outside. For the same purpose, man-made building materials were employed to build houses, which are now known to let out some harmful gases.

Facing the serious challenge, scientists have been searching for a way to handle the problem. To everyone’s delight, they discovered a natural pollution control system for building—green plants, though they do not really know how plants control air pollution. Scientists suppose that a plant’s leaves absorb or take in the pollutants and in exchange gives out oxygen through its leaves and tiny organizations on its roots. Therefore they recommend that all buildings should have one large plant or several small plants inside for every nine square meters of space. Because studies indicate that different plants absorb different chemicals, the most effective way to clean the air is to use different kinds of plants. In conclusion, having green plants inside your house can make it a prettier and healthier place. Why not try?

1.Which of the following statements is TRUR?

2.According to scientists, some kind of indoor pollution can be found in ________.

3.What does the underlined part “To do this” refer to in Para3?

4.The reason why we should use different kinds of plants to clean the air is that ___.

文中有10处错误,每句最多两处;每处错误仅涉及一个单词的增加(在缺词处加一个漏字符号 ^，在其下面写出加的词)，删除(把多余的词用斜线\划掉)或修改(在错词下划—横线,在下面写出修改后的词)。

注意:1.每处错误及修改仅限一词；2. 只修改10处, 从第11处起, 不计分。

College students have a little ways to pay their college fees. Many students

have their parents to pay the fees. Some students may apply to a bank loan and

others will try to find part-time jobs in and out of the campus. Apart from this,

many good student can win a scholarship. By this way they can pay at least part

of the fees. As to me, I will let my parents pay half of their fees because they are

rich enough. Beside my study, I will take up a part-time job by teach some high

school students math, physics, chemistry and English, as I’m very good at these

important subjects. Of course I will also work very hard at my lessons in order to I can easily win a scholarship.

单词拼写（每小题1分，共10分）

1.Kindness is one of our Chinese__________________(特征)．

2.The teacher____________(分成) us into 3 small groups and we began to play.

3.It is______________(要求) that the students not use calculators in maths tests.

4.They'll arrive in 5 minutes，____________(同时)we have some tea.

5.You can slow the bleeding by applying __________(压力) to the wound.

6.She was even less______________(热情的) about going to see the film.

7.What you do is not_____________(与……一致) with what you say.

8.The cat _____________(吞下) a bird just now.

9.The English_____________(系) of our school will hold a celebration.

10.The injured were carried into the____________(救护车) immediately.

__46   People use money to buy food, furniture，books，bicycles and hundreds of other things they need or want. When they work, they usually get paid in money．

Most of the money today is made of metal or paper．  47   One of the first kinds of money was shells．

Shells were not the only things used as money．In China，cloth and knives were used. In the Philippine Islands, rice was used as money for a long time. Elephant tusks，monkey tails and salt were used as money in parts of Africa．

The first metal coins were made in China, They were round and had a square hole in the centre．  48   

Different countries have used different metals and designs for their money．  49   Sweden and Russia used copper(铜) to make their money. Later some countries began to make coins of gold and silver.

But even gold and silver were inconvenient if you had to buy something expensive. Again the Chinese thought of a way to improve money．__ 50   The first paper money looked more like a note from one person to another than the paper money used today.

Money has an interesting history from the days of shell money until today．

 A．Today anyone will accept money in exchange for goods and service．

B．The first coins in England were made of tin(锡)．

C．But people used to use all kinds of things as money．

 D．Money, as we know, is all made of paper.

E．They began to use paper money.

F.  People strung(串连) them together and carried them from place to place．

G．No one knows for certain when people began to use money．