1. This passage is about .
A. maglevB. magnetsC. levitationD. electricity
2. Which of the following is a repelling action?
A. ⇨⇦ B. ⇦⇨ C. ⇧⇧ D. ⇩⇩
3. 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.
4. 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】1—4、ABDD
阅读理解。
Temperature is measured by means of a thermometer (温度计). One general form of thermometer depends upon the fact that most solids and liquids expand as their temperature rises. There are one or two exceptions. There is, for instance, a kind of steel called invar (from “invariable”) which does not change its dimensions as temperature changes; it is valuable for making pendulums (钟摆), since, if the length of a pendulum changes, its time of vibration changes. It is also used for making very accurate measuring scales. In both cases, then, changes of atmospheric temperature have no effect if invar is used.
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