摘要： The passage mainly talks about . A. the Gisbornes' 12-day trip to New York B. the first solar-powered boat across American canal system C. a new invention to replace gas-powered boats D. the shortcomings of solar-powered boats for everyday use 答案: Gisbornes一家完成了12天的运河旅行.不过使这次旅行与众不同的是他们的船主要依靠太阳能来驱使行进.

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