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11-25
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2017年12月大学英语四级阅读理解试题及答案（4）
If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for lus to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by American scientist, Professor Carl Sagan.
Sagan believes that before the earth's resources are compleetely exhausted it will be possible to change the atmophere of Venus and so create a new world almost as large as earth itself. The difficult is that Venus is much hotter than the earth and there is only a tiny amount of water there.
Sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in condition similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceship will then fly to Venus a...
11-24
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2017年12月大学英语四级阅读理解试题及答案（3）
Personality is, to large extent, inherent - A-type parents usually bring about A-type offspring. But the environment must also have a profound effect, since if competition is improtant to the parents, it is likely to become a major factor lives of their children.
One place where children soak up A characteristics is school, which is, by its very nature, a highly competitive institution. Too many schools adopt the "win at all costs"moral standard and measure their success by sporting achievements. The current passion for making children compete against their classmates or against the clock produces a two-layer system, in which competitive A types seem in some way better than thier B-type fellows. Being too keen to win can have dangerous consequences: remember that Pheidippides, the first marathon runner, dropped dead seconds after saying:"Rejoice, we conquer!".
By far the worst form of competition in school is the disproportionate emphasis on examinations. It is a rare school that allows pupils to concentrate on those things they do well. The merits of competition by examination are somewhat questionable, but competition in the certain knowle...
11-23
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2017年12月大学英语四级阅读理解试题及答案（2）
A subject which seems to have been insufficiently studied by doctors and psychologists is the influence ofgeography and climate on the psychological and physical health of mankind.There seems no doubt that the general character of the landscape, the relative length of day and night, and the climate must all play a big part in determining what kind of people we are.
It is true that a few studies have been made. Where all the inhabitants of a particular area enjoy exceptionally good or bad health, scientists have identified .contributory factors such as the presence or absence of substances like iodine, fluoride, calcium, or iron in the water supply, or perhaps types of land thatprovide breeding places for pests like mosquitoes or rats.
Moreover, we can all generalize about types of people we have met. Those living in countries .with long dark winters are apt to be less talkative and less vivacious than inhabitants of countries where the climateis more equable(稳定的). And where the olive and the orange grow, there the inhabitants are cheerful, talkative, and spontaneous.
But these commonplace generalizations are inadequate: the influence: of climate and geography should be studied in depth. Do all mountain dwellers live to...
11-22
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2017年12月大学英语四级阅读理解试题及答案
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour's flight one of the scientists wrote in his book, 'Look here for probable metal' Scientists in another airplane, flying over a mountain region, sent a message to other scientists on the ground,'Gold possible.' Walking across hilly ground, four scientists reported,'This ground should be searched for metals.' From an airplane over a hilly wasteland a scientist sent back by radio one word,'Uranium'.
None of the scientists had X-ray eyes: they had no magic powers for looking down below the earth's surface. They were merely putting to use one of the newest methods of location minerals in the ground - using trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing.
This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface.
At Watson Bar Creek, a brook six thousand feet high in the mountains of Br...
06-14
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