65.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.Coilisions of smaller asteroids with Earth occur more often than expected.

　　D.lt’s still too early to say whether such a collision might occur.

　　66.What do people think of the suggestion of using nuclear weapons to alter the course of asteroids?

　　A.It sounds practical but it may not solve the problem.

　　B.It may create more problems than it might slove.

　　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 applicable.

　　67.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 unlike to happen in our

　　lifetime.

　　D.workable solutions still have to be found to prevent a collision of asteroids with Earth

　　D

　　While still in its early stages, welfare reform has already been judged a great success in many states-at least in getting people off welfare. It’s estimated that more than 2 million people have left the rolls since 1994.

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