英语专业四级听写答案(7)

英语专业四级听写练习答案

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Today there is a new way for travelers to figure out where they are. It is the GPS. It has 24 satellites that orbit the earth and constantly broadcast their positions. Someday you may carry a small receiver as you hike and use GPS to find out if you are there yet!

Useful Words and Expressions:

1. dipper北斗七星

2. compass 罗盘

3. pedometer 步数计

4. GPS= Global Position System全球定位系统

5. orbit 轨道，绕……轨道而行

6. receiver 接收器

Waves

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

through walls, but sound waves can. That is why you can hear in another room even though you cannot see them. The energy of some waves An earthquake produces seismic waves.

Shake the spring to transfer energy to it. What spring bounces up and down in Light waves travel 300,000 kilometers miles) per second! They can also travel earth!

Useful Words and Expressions;

1. destructive 破坏的

2. seismic地震的

3. vacuum真空

Soils

There are kinds of soils. Different soils have different types of rock and In some places, soil layers are very thick. Lots of plants grow in places with a thick soil layer. In dry and windy places soil layers are much thinner. Layers of soil on mountains are thin because gravity pulls the soil downhill.

The type of soil in a particular place affects what kinds of plants can grow there.

Useful Words:

1. clay 黏土，泥土

2. loam 肥土

3. layer 层

4. gravity 地心引力，重力