17. This passage is about　.

　　A. maglevB. magnetsC. levitationD. electricity

　　18. Which of the following is a repelling action?

　　A. ⇨⇦ B. ⇦⇨ C. ⇧⇧ D. ⇩⇩

　　19. What can we learn from the text?

　　A. A magnet-filled guiding way is formed inside a maglev train.

　　B. Instead of electricity, magnets are used as the power of a maglev.

　　C. Maglev trains can climb hills with the help of magnet wheels.

　　D. Electric currents decide the movements of a maglev train.

　　20. What is the difference between a maglev train and an ordinary train?

　　A. A maglev train can climb mountains without power while an ordinary one can’t.

　　B. A maglev train can travel in college campus while an ordinary train is not allowed.

　　C. Traveling without a track, a maglev train is safer and smoother than an ordinary one.

　　D. Floating on a track, a maglev train is faster, quieter than an ordinary railway train.

　　【参考答案】17. ABDD

　　阅读理解

　　Feeling blue about the world? “Cheer up,” says science writer Matt Ridley.” The world has never been a better place to live in, and it will keep on getting better both for humans and for nature.”

　　Ridley calls himself a rational optimist—rational, because he’s carefully weighed the evidence; optimistic, because that evidence shows human progress to be both unavoidable and good. And this is what he’s set out to prove from a unique point of view in his most recent book, The Rational Optimist. He views mankind as a grand enterprise that, on the whole, has done little but progress for 100,000 years. He backs his findings with hard facts gathered through years of research.

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