Passage Three
　　Questions 31 to 35 are based on the following passage.
　　As supplier of most of the food we eat and of raw materials for many industrial processes, agriculture is clearly an important area of the economy. But the industrial performance of agriculture is even more important than this. For in nations where the productivity of farmers is low, most of the working population is needed to raise food and few people are available for production of investment goods or for other activities required for economic growth. Indeed, one of the factors related most closely to the per capital income (人均收入) of a nation is the fraction of its population engaged in farming. In the poorest nations of the world more than half of the population lives on farms. This compares sharply with less than 10 per cent in Western Europe and less than 4 per cent in the United States.
　　In short, the course of economic development in general depends in a fundamental way on the performance of farmers. This performance in turn, depends on how agriculture is organized and on the economic environment, or market structure, within which it function. In the following pages the performance of American agriculture is examined. It is appropriate to begin with a conversation of its market structure.
　　31. This passage is most probably ________.
　　A) a news item
　　B) part of an introduction of a book
　　C) part of a lecture
　　D) an advertisement（B）
　　32. What is most important to agriculture is ________.
　　A) the amount of food it produces
　　B) the per capital income of farmers
　　C) its industrial performance
　　D) the production of investment goods（C）
　　33. The word “this” in Line 4 refers to ________.
　　A) the provision of food and raw materials
　　B) the productivity of farmers
　　C) the production of investment goods
　　D) the economy as a whole（A）
　　34. The performance of farmers essentially determines ________.
　　A) the size of the working population
　　B) the organization of agriculture
　　C) the market structure
　　D) the general development of economy（D）
　　35. This passage will most probably be followed by a discussion of ________.
　　A) the structure of American farming population
　　B) the market structure of American agriculture
　　C) the various functions of American agriculture
　　D) the organization of American agriculture（B）

　Passage Four
　　Questions 36 to 40 are based on the following passage.
　　Before 1945, hardly anyone outside of New Mexico had ever heard of Alamogordo. In 1960 its population numbered 21,723. Ever since 1898, when the town had been built by the Southern Pacific Railroad, Alamogordo had been a lonely town. The land around it was largely desert, and largely empty.
　　Because it was isolated and because the weather was almost always clear and peaceful, a spot of desert near Alamogordo was chosen as the last site for the first atomic bomb ever exploded. The secret name of the test was Zeo.
　　At dawn on July 16, 1945, the atomic bomb was set off. Observers agreed that they had witnessed something unlike anything ever seen by men before, a huge, colorful fireball, more brilliant than the sun flashing as it rose for miles into the air. Never before had men released so much power at one time, nor had any nation ever possessed weapon as terrible and destructive as the atomic bomb.
　　For several weeks, the test was kept secret. When an atomic bomb was dropped from an American plane on Hiroshima, Japan, newspapers and radio stations all over America told of the test of the bomb in New Mexico. Almost everybody was amazed to learn where the bomb had been made and tested; the deserts of the Southwest had hidden the secret well.
　　When news of the atomic bomb and its destructiveness was announced, people all over the world wondered what other new weapons were being prepared in the New Mexico desert. Some people doubted that the secret of making atomic bombs could be kept from other countries. Some even doubted the wisdom of using so powerful a weapon. But no one doubted that a new kind of war—and a new kind of world—had begun at Alamogordo, one summer morning in 1945.
　　36. What is the main topic of this passage?
　　A) The secret of Alamogordo.
　　B) A new kind of war.
　　C) The destructive force of the first atomic bomb.
　　D) The selection of the test site for the first atomic bomb.（A）
　　37. Which of the following is the main reason for choosing Alamogordo as the test site?
　　A) It always had an enjoyable climate.
　　B) It was connected to other cities by a railway.
　　C) Its location would hide the secret well.
　　D) It was situated in southwestern New Mexico.（C）
　　38. When was the atomic bomb dropped on Hiroshima?
　　A) As soon as the secret was revealed

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