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2. He never (回复) to any of my letters. So I stopped writing to him.

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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 

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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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His bag  snacks.

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   A. say   B. says   C. saying   D. to say

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