解析：　本文第三段肯定了Carla老师的教学方法，由第四段第一句“You can use the same technique when you evaluate your child’s work at home.”可知。

　　答案：　C

　　5．Having read the last paragraph，we can conclude that________.

　　A．pride goes before a fallB．practice makes perfect

　　C．no pains，no gainsD．failure is the mother of success

　　解析：　A的大意为“胜不骄、败不馁”；B为“熟能生巧”；C为“不劳、不获”；D“失败乃成功之母”。故D为答案。

　　答案：　DA,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?

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