bijecu大學(xué)英語(yǔ)四級(jí)閱讀理解試題及答案-資料下載頁(yè)
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【正文】 e a present for assistant spoke to Edith because she seemed_______. in ties need of fort stopped at the next counter_________. 39。s father smoked a pipe_______. he was obliged social occasions time to time he was delighted was very disagreeable at that time of the year because_______. trod on each other39。s toes poked each other with their elbows knocked each other were doing their shopping in a great hurry 答案：dbdcd十 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 the middle of the 21st century,if present trends continue, we will have used up all the oil that drives our cars,for 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 earth39。s resources are pleetely 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 soon as this has been done, the algae will be placed in small rockets. Spaceship will then fly to Venus and fire the rockets into the atmosphere .In a fairly short time, the alge will break down the carbon dioxide into oxygen and carbon. When the algae have done theri work, the atmosphere will bee cooler,but befor man can set foot on Venus it will be neccessary for the oxygen to produce rain. The surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus. long run, the most insoluble problem caused by population growth on earth will probably be the lack of ______.
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