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, we'll have a way to change its course.

　　Some scientists favour pushing asteroids off course with nuclear weapons. But the cost wouldn'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 rare--but if one did fall, it would be the end of the world. "If we don't take care of these asteroids, they'll take care of us.”Says one scientist, "It's that simple.”

　　The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth?擳he 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?

　　we

　　A. They are heavenly bodies different in composition.

　　B. They are heavenly bodies similar in nature.

　　C. There are more asteroids than meteoroids.

　　D. Asteroids are more mysterious than meteoroids.

　　66. What do scientists mainly talk about the collision of an asteroid with Earth?

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