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2. 在我回家的路上遇到了他们。

I them my .

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                   New energy in the 21st century 

Energy from the wind 

    Wind is a kind of clean energy,and there is lots of it. But if there’s no wind,there is no wind energy.

Energy from the water 

    When water moves from a high place to a lower place,it can make electricity (电) without pollution. However,people have to build dams (水坝) to use this energy,and building dams is very expensive. 

Energy from the earth 

    There is heat in the rocks under the earth. Scientists use the heat to make geothermal (地热的) energy. This kind of energy is cheap,but it is only possible in a few places in the world.

Energy from the Sun 

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根据短文内容,完成表格。

New energy in the 21st century

Sorts of energy

Advantages

Disadvantages

Wind energy

Clean. There is a lot.

It needs 1 .

Water energy

No 2 .

It is expensive to build dams.

Geothermal energy

 3 .

It’s only  4 in a few   places.

Solar energy

Clean and plentiful.

It depends too much on(太依赖于)5  .

  1. 2. 3. 4. 5.

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