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2016英语专四听力dictation模拟练习（20）

2016-04-12 14:46:12来源：网络

2016英语专四听力dictation模拟练习（20）

　　2016英语专四改革，听力部分dictation看似简单的从15个句群变成了10个，但是句子长度变长，所以考生们在考前要多练听力同时提高自己的注意力集中时长。

　　Waves

　　How does light get from the sun to the earth? How does musicget from the stage to the audience? They move the same way-----in waves!

　　Light and sound are fomp3s of energy. All waves carry energy,but they may carry it differently. Light and sound travelthrough different kinds of matter. For example, light wavescannot move through walls, but sound waves can. That is why you can hear people talking inanother room even though you cannot see them. The energy of some waves is destructive. Anearthquake produces seismic waves.

　　Catch a wave. Ask a friend to stand a few feet away from you. Stretch a spring between you.Shake the spring to transfer energy to it. What happens? The spring bounces up and down inwaves. When the waves reach your friend, they bounce back to you!

　　Light waves travel 300,000 kilometers (186,000 miles) per second! They can also travel through avacuum. That is why light from the sun and distant stars can travel through space to the earth!

　　Useful Words and Expressions;

　　1. destructive 破坏的

　　2. seismic地震的

　　3. vacuum真空

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