從下列每篇短文的問(wèn)題后所給的四個(gè)選項(xiàng)中選出一個(gè)最佳答案，并在答題紙上將相應(yīng)的字母涂黑。

Passage One

　　Questions 21 t0 25 are based .on the following passage.

　　The American population was the tallest in the world from about the American Revolution to World WarⅡ -that's a long time. The U. S. had a very resource-rich environment, with game, fish and wildlife. In fact we have data on disadvantaged people in America, such as slaves. They were obviously among the most mistreated populations in the world, but given the resource abundance, and given the fact that the slave owners .needed ,their work, they had to be fed. relatively decently. So the slaves were taller than European peasants. It's no wonder that Europeans were just flooding to America.

　　Americans today are no longer the tallest people in the world. After World War ‖many Western and Northern European countries began to adopt favorable social policies. There is universal health insurance in most of these societies-that ,of course; makes a difference in health care. You can also consider income inequality in the U. S. ; since-people who are. at the low end of the totem pole(圖騰柱) have considerable adversity making ends meet. I suspect The difference in height between Americans and Europeans is due to both diet and health care.

　　Americans today suffer from an additional problem: obesity. If children are too well nourished, then they're not able to grow optimally. There are certain hormones that control the start of' the adolescent growth and the start of adolescence. Nutrition is one of the factors, along with genetic and hormonal ones which are associated with the start of puberty(青春期) . And if puberty comes too early, then the youth will peak out sooner, and will not become as tall in adulthood as someone who had better nutrition. Also, the overload of carbohydrates and fats in a fast-food diet may hinder the consumption of micronutrients essential to growth.

　　21. The word "game" in sentence 2,para.1 refers to _____

　　A. animals hunted for food B. rich natural resources

　　C. activities played by kids D. sports events’ to be held

　　22. Slaves in America were taller than European peasants because _____ .

　　A. they were badly treated B. they did not do farm work

　　C. they had sufficient food to eat D. they enjoyed better health care

　　23.lt is implied in the second paragraph that _______ .

　　A. Europeans could make more 'money than Americans .

　　B. average Americans used to be shorter than Europeans

　　C. welfare helps Europeans grow taller than Americans

　　D. people on the totem pole are leading a comfortable life

　　24. According to the third paragraph, overweight children in the U..S. ________

　　A. tend to have better nutrition for growth B. tend to eat 'more food to grow taller

　　C. will grow taller than average children D. will fail- to grow into an ideal height

　　25. Eating too much fast food may affect .

　　A. the absorption of micronutrients ' B. the intake of carbohydrates

　　C. the consumption of hormones D. the digestion of fats

　　Passage Two

　　Questions 26 t0 30 are based. on the following passage. .

　　The threat of a global outbreak(疾發(fā)) of bird flu makes it urgent for the international community to cooperate effectively. Wealthy countries will have to provide hundreds of millions of dollars for the testing and production of medicines necessary for treating patients suffering from bird flu. Developing countries, particularly in Southeast Asia, where the bird flu virus(病毒) has spread since 1997 , must work out special programs so that farmers will not hide signs of possible outbreaks. In addition, the way such farm birds as chickens and ducks are traditionally raised and marketed in the" developing world should be changed; there should be more distance between the birds and their keepers. Countries should deal with the disease with joint effort. If one country is inadequately prepared, -it will be a threat to every other country.

　　The potential effects of' a national outbreak of bird flu are enormous. Firstly, an outbreak may kill large numbers of people. World Health Organization ( WHO) estimates that an outbreak similar to The mild Hong Kong flu of 1968 could kill as many as 7.4 million people. If it were as dangerous as the 1918 Spanish flu, which killed 50 million, the number would be much higher. Secondly, such an;' outbreak may cause great financial damage: The latest. outbreak of bird flu, which began in December 2003, has cost Southeast Asia more than $10 billion and depressed its GDP by l. 5 percent. If a new outbreak of' bird flu were to last for a whole year, $800 billion would be lost.

　　Despite the 124 human cases and 63 deaths from. bird 7flu since December 2003, the virus remains mainly a disease of animals. However, the more animals that die of the disease, the more chances it has of spreading to people. Large numbers of dead or dying birds mean that more people will be exposed to the. virus, which could in theory combine with a human flu virus and change into a virus with new characteristics. If the international community works together efficiently, man can surely prevent such a virus and possibly save millions of lives.

　　26. Faced with the threat of a global outbreak of bird flu, the international community should ______

　　A. establish new markets B. work together effectively

　　C. stop birds from flying to other countries D. raise fewer chickens and ducks

　　27. The second paragraph focuses on ______ .

　　A. World Health Organization B. flues in Hong Kong and Spain ;

　　C. the economy of Southeast Asia D. possible effects of a bird flu outbreak

　　28. The number of people who have died of bird flu since 2003 is ________.

　　A.63 B. 124

　　C. 7.4 million

　　D. 50 million

　　29.In the third paragraph, the author is mainly interested in ___________ .

　　A. stimulating financial growth B reducing economic damages

　　C. saving human lives D. protecting bird species

　　30. The passage deals with all the following aspects about bird flu EXCEPT --

　　A. the origin and history of bird flu B. the importance of international cooperation

　　C. the possible dangers of a national outbreak D. the significance(,f preventing it from spreading

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