48. off 　　49. prisoners　 50. a　 51. because　 52. them　 53. In

16. South Western China　 17. their skins　 18. sutiable food　　 19. at birth　 20. since 1963

单项选择

21-35 　　 ABCAD　　　　　 DADAC　　　　 DCDDB

完型填空

36-47 　DABCD　 　　BADDA　 　AA

4．为了保护水资源，防止水污染，我们必须采取措施，与各种污染作斗争。

听力

1-5 BCCBC　　　 6-10 BACBC　　 11-15 BCAAC

3．许多河流和湖泊开始被工厂排出的污水所污染。

2．随着现代工农业的迅速发展，越来越需要更多的水。现在许多地方的水已经变得越来越缺乏。

84.What can we learn about the research with mice ?(no more than 13 wrods )

　 _______________________________　　　　　　　　　 ___________________________

Section C(25 scores)

Directions: Write an English composition according to the instructions given below in Chinese.

以 “The Importance of Water” 为题，用英语写一篇不少于120词左右的短文，要点如下： 1．没有水便没有生命。

83.How does the gene work in the growth of animal ?(no more than 8 words)

　 ____________________　　　　　　　　　　　　　　　　　　　　　 _______________

82.Why do the scientists do such a research ?(no more than 15 words)

________________　　　　　　　　　　 ________________________________________

81.How many kinds of aminals have scientists put copies of human gene into ?(no more than 1 word)

　　 ____________　　　　　　　　　　　　　　 　　　　　　　　　　　　　　　________　　　　　　　

70.Which of the following questions has NOT been discussed in the passage?

A. How can we know one is suffering from malaria?

B. How many people are killed by malaria each year?

C. Why are there so many people suffering from malaria？

D. What has been done to keep people unaffected for long？

PART FOUR: WRITING

Section A (10 scores)

Directions: Read the following passage. Answer the questions according to the information given in the passage and required words limit.Fill in the blanks NO MORE THAN THREE WORDS .

Do you know that more than 70% of the earth dryland is affected by desertification?

　 About 3.6 billion of the world’s 5.2 billion hectares of useful dryland for agriculture has suffered erosion and soil degradation. In more than 100 countries, 1 billion of the 6 billion world population is affected by desertification, forcing people to leave their farms for jobs in the cities.

　 Desertification takes place in dryland areas where the earth is especially fragile, where rainfall is nil and the climate harsh. The result is the destruction of topsoil followed by loss of the land’s ability to sustain crops, livestock or human activity. The economic impact is horrendous, with a loss of more than billion per year in agricultural goods and an increase in agricultural prices.

　 Climate changes can trigger the desertification process, but human activities frequently are the proximate cause. Overcultivation exhausts the soil. Defoerstation removes trees that hold the soil to the land. Overgrazing of livestock strips the land of grasses. According to a UN study, about 30% of the earth’s land -----including the 70% of dryland---- is affected by drought. Everyday, about 33,000 people starve to death.

　 Desertification create conditions that intensify wildfires and stirring winds, adding to the tremendous pressure to earth’s most precious resource, water, and of course, the animal dependent on it. According to the World Fund for Nature, the world lost about 30% of its natural wealth between 1970 and 1995.

　 Dust from deserts and drylands are blown into cities around the world. Dust from America reaches Europe through the Pasat wind, and even reaches US cities. Dust particles, which are less than 2.5 millionths of a meter in size, are inhaled, causing health problems and have been shown to boost death rates.

　 The UN has called on all the countries to work together to fight against desertification, and better our living conditions.

Section B (10 scores)

Agricultural scientists in the United States have put a copy of a human gene into pigs, sheep and rabbits. They report that the gene seems to be working in some of the animals. The gene that the scientists are using controls the production of human growth hormone (荷尔蒙)，a chemical necessary for growth.

They are using the human gene because it has been more closely studied than any other growth gene. The scientists hope their work will someday result in food animals that grow faster and larger or produce more milk or eggs. The research is being done by scientists at the University of Pennsylvania, the University of Washington and the United States Department of agriculture. The scientists put copies of human growth hormone into the fertilized eggs of the female animals. When baby animals were born from the eggs, the scientists looked for evidence that the human gene had become part of the animal’s genetic material. They examined almost 200 baby pigs and found the gene in 20 of them. They found it in 28 of more than 200 rabbits, but it was in only one of 73 baby sheep. The scientists said they found the human growth chemical produced by the gene in some of the animals.

It is too soon to know if the animals will pass the transplanted human growth gene to their young, proving that the gene has become permanent (永久的) part of their genetic material. Similar research with mice two years ago produced a new kind of mouse that is two times larger than normal. The scientists hope the same thing will happen with farm animals. They say their research will permit other gene transplants that can give animals defense against diseases, or let them live in very hot or very cold places. American farmers already use chemical hormones to increase the size of cattle and the amount of milk they produce. But they have to put the hormones into the cows. If the gene transplants are fully successful, the cow’s body will produce growth hormone.