2. 考研
  3. Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say so

Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say so

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问题     Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists.
    Asteroids are bigger versions of the meteoroids (流星) that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a collision 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 of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course.
    Some scientists favor 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 consequences are 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 big 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? "The world has less to fear from doomsday (毁灭 性的) rocks than from a great nuclear fleet set against them," said a New York Times article. (272 words)
What do scientists say about the collision of an asteroid with Earth?
选项 A、It is very unlikely but the danger exists.
B、Such a collision might occur once every 25 years.
C、Collisions of smaller asteroids with Earth occur more often than expected.
D、It’s still too early to say whether such a collision might occur.
答案A
解析 本题属于推理题。文章的第五段的后三句说道：专家们认为虽然小行星与地球相撞的可能性很小一一每50万年一次，但一旦发生了便是世界末日。有一位科学家说：“如果我们不注意它们(小行星)，它们就会注意(袭击)我们，事情就是那么简单。”由此可知，A是正确的。
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