2. 在我回家的路上遇到了他們。

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 (電) without pollution. However,people have to build dams (水壩) 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?zé)岬? energy. This kind of energy is cheap,but it is only possible in a few places in the world.

Energy from the Sun 

    Solar panels (太陽電池板) on the roofs of houses can turn energy from the Sun into electricity. Solar energy is clean and plentiful (豐富的) . But when the weather is bad,it doesn’t work.

根據(jù)短文內(nèi)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(太依賴于）5  .

  1. 2. 3. 4. 5.

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