A. It is very unlikely but the danger of its happening exists.
B. Such a collision might occur once every 50 thousand years.
C. Collisions of smaller asteroids with Earth occur more often than expected.
D. It's still too early to say certainly whether such a collision might occur.
67. What do people think of the suggestion of using nuclear weapons to change the course of asteroids?
A. It sounds practical but it may not solve the problem.
B. It may create more problems than it might solve.
C. It is a waste of money because a collision of asteroids with Earth is very unlikely.
D. Further research should be done before it is proved useful.
68. 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's unlikely to happen now
D. workable solutions still have to be found to prevent such a collision of asteroids with Earth
D
Why do people pay a screaming soldier to order them to crawl under camouflage(伪装)netting before dropping to the ground to do 15 pushups?
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