— _______ are these apples?

— $3.99.

A.How long B.How much C.How heavy D.How big

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Rubber Fish

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Choose the best answer（根據(jù)短文內(nèi)容，選擇最恰當?shù)拇鸢福?

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Asteroids are bigger versions of the meteoroids（流星體） that race 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 $500 million worth of new telescopes right now, they 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.

Is it worth it？ Two things experts consider when judging any risk are: （1） How likely the event is; （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 years. Sounds pretty rare but if one did fall. It would be the end of the world. “If we don’t take care of these big asteroids, they’ll take care of us,” says one scientist. “It’s that simple. ”

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1.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.Asteroids are more mysterious than meteoroids.

2.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.

3.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 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 applicable.

4.We can conclude from the passage that

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C.the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime.

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