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    9.   艺术节          art_________

    10.过得愉快           ____ a good______

    9. festival   10. have; time

    题目来源：同步导学案课时练七年级英语上册人教版 > 单元复习课

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    Every time you turn on the television or take a ride in a car, you could be adding to a problem called acid rain (酸雨).In this article, you’ll learn how acid is created, and how it affects (影响）us, and more importantly, what we all can do to prevent it.

    How is acid rain created?

    When people use fuels (燃料)，such as coal and oil, poisonous (有毒的）gases are given off. When these gases mix with rain, acid rain forms. Many power stations bum fuels in order to create the electricity    (电）that we use in our homes and offices every day. Cars    and    trucks    also send these    gases

    into the    air    when they bum gasoline. When rain mixes with these    gases,    harmful    things    called    acids

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    Acid rain damages (毁坏)everything that it touches. It poisons our rivers, ponds, lakes, and oceans along with all the life in them. It pollutes our soil and crops, harms trees, and can even kill fish and plants. Acid rain also eats away at buildings.

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