| Questions 11-15 are based on the following
passage: Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands (腺) in A. stopped migrating B. continued migrating C. stayed in the north D. migrated south and stayed there 更多"Questions 11-15 are based on the fo"的相关试题: [单项选择]Questions 7 to 10 are based on the following passage.
At the end of the passage, you will be given 20 seconds to answer the
questions.
Now, listen to the passage. Which of the following gifts may be on a normal Christmas wish list A. Movie tickets. B. A used book. C. A nearly-new kitchen tool. D. A recycled ornament. [单项选择]Questions 6 to 10 are based on the following passage:
Human needs seem endless. (78) When a hungry man gets a meal, he begins to think about an overcoat, when a manager gets a new sports car, a big house and pleasure boats dance into view. The many needs of mankind might be regarded as making up several levels. When there is money enough to satisfy one level of needs, another level appears. The first and most basic level of needs involves food. Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears. By the end of World War II, these needs were satisfied for a great majority of Americans. Then a third level appeared. It included such items as automobiles and new houses. By 1957 or 1958 this third level of needs had fairly well been satisfied. Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching" level. (79) While the other levels involve physical satisfaction, that is, the feed i A. were very rich B. lived in poverty C. had the good things on the first three levels D. did not own automobiles 我来回答: 提交
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