A. They should cry if hurt.

　　B. They should keep firm not to cry to show they are not wimps.

　　C. They should be brave in face of physical pain and cry if necessary when facing other problems.

　　D. They should “let it out”whatever problems they meet with.

　　【参考答案】1—4、DCBC

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　A Train Floating On Air

　　A train that floats on air? It’s not magic — it’s magnets (磁). And it’s close to reality.

　　In Virginia USA the fall of 2002, a train with no wheels traveled on air and carried college students across their campus. In Japan, a whisper-quiet railway engine hovered and raced at 350 miles per hour using magnets and electricity as the power. And in China, a magnet train line linked Shanghai with nearby Pudong Airport.

　　These trains use magnetic levitation (悬浮) technology, “maglev” for short. They use the same rules as the magnets you pick up at home or school: opposite poles of magnets attract each other, and like poles repel each other.

　　How does it work?

　　Powerful magnets on the bottom of the train repel magnets on the track, which is actually just a magnet-filled guiding way. With a magnetic field of sufficient force, the train will go hovering on air, which seemed impossible to us in the past.

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