Many disease researchers have warned that rising global temperatures could lead to more diseases, for example by allowing tropical diseases to expand their ranges into what are now mild regions.This is a particular fear for the diseases carried by insects such as malaria(疟疾)and sleeping sickness.

But the reality is more complex, argues Kevin Lafferty, a disease ecologist.He argues that a warming climate could favour some diseases in certain regions while controlling them in others.

Lafferty does not deny that climate change might allow malarial mosquitoes to spread to new areas.However he believes that hotter and drier conditions may also get rid of mosquitoes from areas where they currently exist.If this were the case, he says, there would be little, if any, net increase(净增长)in the risk of disease.

In addition, many mild regions such as southern Europe or the southern U.S. have good sanitation(卫生设备) and insect control programmes which, Lafferty says, would prevent diseases from becoming common even if climatic conditions were suitable.

Finally, he argues, climate change could wipe many species off the plant.Infectious pathogens(病原体)depend on their hosts for survival so they too may become endangered-especially if they, like malaria, rely on more than one host.

But Mercedes Pascual of the University of Michigan points out that there are large human populations in the east African highlands, just outside of the existing range of malarial mosquitoes.She said as temperatures rise, the mosquitoes will reach these areas.So the disadvantages will outweigh the advantages of decreased risk elsewhere.

Most of the ecologists do, however, seem to agree on one point: predicting where a disease is going to go next involves far more than just considering climate.No matter what the results of the debate are, they all agree that health concerns should continue to play a critical role in climate policy, and the debate shouldn't be regarded as weakening the case for action against global warming.

1.According to Kevin Lafferty, climate change__________.

    A.will not increase the spread of insect-borne diseases

    B.may not significantly increase the risk of disease in the whole world

    C.will not affect the dry regions where sanitation is good

    D.may not affect viruses that depend on more than one host

2.What does Mercedes Pascual think of Lafferty 's conclusion?

       A.She disagrees with it.                       B.She supports it.

       C.She is not sure of it.                        D.She thinks it needs proving.

3.We may infer from the passage that ___________.

    A.climate is the only factor in the prediction of the spread of diseases

    B.when making a climate policy one should take health into account

    C.the debate mentioned in the passage furthers the debate on global warming

    D.a policy should be made immediately to try to stop climate change

4.We can learn from the passage that ___________

    A.all the disease researchers agree that climate change will spread disease

    B.nothing can be done to stop the present global warming

    C.scientists have found ways to stop the wild spread of disease

    D.ecologists have different views on whether the global warming will spread diseases further

In 1789 the U.S. government passed a law which said that the land of the American Indians could never be taken from them without their agreement.One hundred years later, however, the Indians only had a very small part of the land that originally belonged to them.How did this great Injustice(不公正)occur?

After 1812 white settlers began to move west across North America.At first, the settlers and the Indians lived in peace.However, the number of settlers increased greatly every year, and slowly the Indians began to see the white settlers as a danger to their survival.To feed themselves, the settlers killed more and more wild animals.The Indians, who depended on these animals for food, had to struggle against starvation.The settlers also brought with them many diseases which were common in white society, but which were new for the Indians.Great numbers of Indians became sick and died.Between 1843 and 1854 the Indian population in one area of the country went down from 100,000 to30,000.

More land was needed for the increasing number of white settlers.In Washington, the old respect for the rights of the Indians disappeared.The old promises to the Indians were broken; the government began to move groups of Indians from their original homelands to other poorer parts of the country.Some Indians reacted angrily and violently to this treatment.They began to attack white settlers, and the Indian war began.For 30 years, until the late 1880s, different groups of Indians fought against the injustices of the white man. They had a few famous successes, but the result of the struggle was never in doubt.There were too many white soldiers, and they were too powerful.Many Indians were killed; the survivors were moved from their homelands to different areas of the country.It was a terrible chapter in the history of a country that promised freedom and equality to everyone.

1.What can we infer from the passage?

     A.In the U.S. there were many laws that provided the rights of American Indians.

    B.The law which was passed in 1789 by the U.S. government was not successfully carried out.

       C.In the 19th century no injustices were done against the Indians by the U. S. government.

    D.The majority of white settlers were openly opposed to the law passed in 1789.

2.According to the passage which of the following is TRUE?

    A.The Indians believed that killing too many wild animals had disturbed the balance of nature.

    B.The government began to have a better understanding of the Indians in the fifties of the nineteenth century.

    C.Between 1843 and 1854 about 70,000 Indians were killed in the battle.

    D.The whites carried serious diseases into where the Indians lived.

3.It is implied in the passage that___    _.

    A.the Indians had many great successes in the Indians wars

    B.the Indians had no doubt that they would win the wars

    C.after the war the Indians stayed where they were before

     D.the Indians were too weak to win the struggle

4.What is the writer's opinion about the treatment that the Indians received from the U.S. government?

    A.He believed that the government always respected the rights of the Indians.

    B.He believed that the government can't be criticized for its treatment to the Indians.

    C.He believed that the government treated the Indians unjustly.

    D.He believed that the government's unfair treatment against the Indians was not on purpose.

此题要求改正所给短文中的错误,对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个钩(√);如有错误(每行只有—个错误),则按下列情况改正:

    此行多一个词:把多余的侧用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

    此行缺一个词:在缺词处加一个漏字符号(^),在该行右边横线上写出该加的词。

    此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

    注意:原行没有错的不要改。

When train fairs went up for the third times in one year, I decided                   1.______

buy a motorcycle to ride to work.My idea was that, although I                    2.______

would have to pay for tax, insurance and gasoline, I will still spend                 3.______

more than on train tickets over the year.I might even save time on                4.______

the journey from home to work.So I bought for one small                            5.______

second-hand Japanese motorcycle.I began to learn to ride them.At first      6.______

it seemed very difficult for me when I had never learned to ride                      7.______

a ordinary bicycle before.But I soon got used to it.I just fell                       8.______

off once or twice during the first few weeks, but after a while                        9.______

I felt reasonable confident and rode to work every day.                                10.______

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