In the United States ______is the fastest growing fuel.A．natural gasB．coalC．oilD．hydropow

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• 1、______ located in New England is the oldest city in the United States.A．ChicagoB．Boston
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• 2、The United States today is the______largest country in size in the world.A．secondB．thirdC．
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• 3、In the United States the legal smoking age is______.A．16B．18C．20D．21
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• 4、In the United States the Senate is presided over by______of the United States.A．the presi
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• 5、The Statue of Liberty in the United States is located in the state of______.A．HawaiiB．Ohio
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• 6、One of the most important lakes in the United States is______ which is the largest fresh
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