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The Pennies is known as the backbone of England.（)
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The Backbone of North America refers to theA．Appalachian Mountains.B．Rocky Mountains.C．Cas
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The economic backbone of Canada includesA．fishing.B．tourism.C．agriculture.D．entertainment
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______is（are)considered as "the backbone of the continent" in America, and is（are) also kn
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______is sometimes called the "backbone of England".A．The Sperrin MountainsB．The Cambrian
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As the backbone of the North American continent, ______is known as the Continental Divide
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The Backbone of North Atnerica refers to theA．Appalachian Mountains.B．Rocky Mountains.C．Ca
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