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A) Because they can provide heat, light or electricity.B) Because they provide more energy than other fuels.C) Because they are not renewable.D) Because they are cheap and convenient.

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A) It is used to provide 50% of U.S. electricity generated by power plants.B) The United States uses more than a quarter of the world’s supply of it.C) It makes up half of the fuel used in the United States.D) The United States has more natural gas than coal.

A) Erosion. B) Water pollution.C) Air pollution. D) All of the above.

A) 1000. B) 600. C) 11. D) 30.

A) Because people regard it as a kind of cute and fluffy animal.B) Because people should not neglect the ugly and endangered animals.C) Because people do not know what a blobfish is.D) Because many people are against using cute animals.

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