单项选择题

What does the passage say about asteroids and meteoroids

A．They are heavenly bodies different in composition.
B．They are heavenly bodies similar in nature.
C．There are more asteroids than meteoroids.
D．steroids are more mysterious than meteoroids.

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单项选择题

Which of the following best describes the anther’s tone in this passage

A．Optimistic.
B．Critical.
C．Objective.
D．Arbitrary.

单项选择题

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 it is unlikely to happen in our lifetime
D．workable solutions still have to be found to prevent a collision of asteroids with Earth