7.Some scientists are working hard at how tide can be_____ (harness) to produce electricity.

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閱讀理解

A

  The Erie Canal was the first important national waterway built in the US. It crossed New York from Buffalo on Lake Erie Troy to Albany on the Hudson River. It joined the Great Lakes with the Atlantic Ocean. The canal served as a route over which industrial goods could flow into the West, and materials could pour into the East. The Erie Canal helped New York develop into the nation's largest city.

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