阅读理解训练题四

阅读理解训练题四内容摘要：

ds of asteroids whose orbits put them on a collision（碰撞） course with Earth. Buy $50 million worth of new telescopes right now. Then spend $10 million a year for the next 25 years to locate most the space rocks. By the time we spot a destructive one, the scientists say, we39。 ll have a way to change its course. Some scientists favour pushing asteroids off course with nuclear weapons. But the cost wouldn39。 t be cheap. Is it worth it? Two things experts consider when judging any risk are: (1) How likely the event is。 and (2) How bad the results if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500， 000 years. Sounds pretty rarebut if one did fall, it would be the end of the world. If we don39。 t take care of these asteroids, they39。 ll take care of us.”Says one scientist, It39。 s that simple.” The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth?” The world has less to fear from the terrible rocks than from a great nuclear fleet set against it,” said a New York Times article. 65. What does the passage say about asteroids and meteoroids? A. They are heavenly bodies different in position. B. They are heavenly bodies similar in nature. C. There are more asteroids than meteoroids. D. Asteroids are more mysterious than meteoroids. 4 66. What do scientists mainly talk about the collision of an asteroid with Earth? A. It is very unlikely but the danger of its happening exists. B. Such a collision might occur once every 50 thousand years. C. Collisions of smaller asteroids with Earth occur more often than expected. D. It39。 s still too early to say certainly whether such a collision might occur. 67. What do people think of the suggestion of using nuclear weapons to change the course of asteroids? A. It sounds practical but it may not solve the problem. B. It may create more problems than it might solve. C. It is a waste of money because a collision of asteroids with Earth is very unlikely. D. Further research should be done before it is proved useful. 68. We can conclude from the passage that______. A. while pushing asteroids off course, nuclear weapons would destroy the world B. asteroids racing across the night sky are likely to hit Earth in the near future C. the worry about asteroids can be left to future generations since it39。 s unlikely to happen now D. workable solutions still have to be found to prevent such a collision of asteroids with Earth D Why do people pay a screaming soldier to order them to crawl under camouflage（伪装） ting before dropping to the ground to do 15 pushups? It39。 s。