2019年英语四级听力文本材料8

坦途网英语四级考试频道专为想要顺利通过四级考试的同学提供帮助。学习讲究的是基础，是时间的规划，不同的阶段集中训练不同的方面，目前正式考试冲刺阶段，一份2019年6月英语四级考试听力材料送给大家，欢迎阅读。

Waves

How does light get from the sun to the earth? How does music get 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 travel through different kinds of matter. For example, light waves cannot move through walls, but sound waves can. That is why you can hear people talking in another room even though you cannot see them. The energy of some waves is destructive. An earthquake 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 in waves. 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 a vacuum. 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

2019年6月英语四级考试临近，越是关键时刻越不能焦躁。如果您还想了解更多四级备考资料、历年真题、考试资讯等相关内容，请利用剩余的备考的时间做好规划并严格执行。坦途网将会及时为各位考生带来更新，欢迎大家进入了解，你会在这里找到非常全面的备考方案！