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 whose orbits put them
on a collision course with Earth. Buy $ 40 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 if t 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.
更多"Unless we spend money to spot and
"的相关试题:
[单项选择]
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 whose orbits put them
on a collision course with Earth. Buy $ 40 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 if t 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.
[单项选择]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.What do scientists say about the collision of an asteroid with Earth 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.
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