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假如你对网课不满意,请发邮件给我们。 Please feel free to s...

假如你对网课不满意,请发邮件给我们。

Please feel free to send us an email if ___________________ the online lessons.

 

you aren't satisfied with 【解析】 对……满意:be satisfied with。根据条件状语从句遵循“主祈从现”的原则,可知主句为祈使句时,从句为一般现在时,故答案为you aren't satisfied with。  
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凯文有语言天赋,能说五门外语。

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People have been using the wind’s energy for a long, long time. More than 5, 000 years ago, ancient Egyptians made boats powered by the wind. In 200 B.C., people used windmills(风车) in China.

Today, we collect the wind’s energy with wind turbines(涡轮). A turbine is similar to a windmill; it is a very tall tower with two or three blades(叶片) at the top. These blades are turned by the wind. The blades turn a generator(发电机) located inside the tower, which creates power.

Groups of wind turbines are known as wind farms. Wind farms can be found near farmland, in narrow mountain passes, and even in the ocean, where there are stronger winds. Wind farms create power for nearby homes, schools and other buildings.

In places like the Midwest and along coasts, winds can provide cheap power. Another great advantage of wind power is that it is a clean form of energy. Wind turbines do not burn oil or coal and do not pollute the air.

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Title: 1. Energy

Ancient times

People in Egypt made wind-powered boats 2. 5,000 years ago.

People in China used windmills in 200 B.C.

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➢ The wind turns the blades and the blades turn the generator to create power.

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Winds produce power at a low 4. in certain areas.

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