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第1题

What did Franklin make after his talks with U.S. captains?（2分） AA map of the Gulf Stream. BA map of the Atlantic Ocean
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第2题

第一心音标志心室收缩开始，心室收缩力增强则第一心音加强。 A. 正确 B. 错误
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第3题

What led Franklin to talk with U.S. captains?（2分） AU.S. ships were longer than British ones. BBritish ships could sail
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第4题

（2分） ATo determine the position of a ship. BTo find the direction of a current. CTo predict the direction of a ship.
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