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. Optimistic. B. Critical. C. Objective. D. Arbitrary.
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. 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.
[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 reace 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 now 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 the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 yea A. while pushing asteroids off course nuclear weapons would destroy the world B. asteroids racing across the night sky are likely to hilt Earth in the near future C. the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime D. workable solutions still have to be found to prevent a collision of asteroids with Earth
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