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A) The windscreen.B) The air conditioning.C) The waterproofing.D) The reflecting mirror.

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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.

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.