大潮（spring tide）与小潮（neap tide）
大潮差是指相邻的之差。A.大潮高潮潮高与小潮低潮潮高B.低潮高潮潮高与大潮低潮潮高C.大潮高潮潮高与大潮低潮潮高D.小潮高潮潮高与小潮低潮潮高
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潮汐（tide）
有时风大流急，船舶靠码头时必须掉头顶流。（）A、A ship has to turn to stem the tide because the wind is strong when she is getting alongside a wharf.B、Sometimes the wind is strong and the current is rough, so a ship has to turn to stem the tide when she is getting alongside a wharf.C、The wind is big, a ship must get alongside a wharf so she has to turn to stem the tide.D、A ship has to turn to stem the tide so she can get alongside a wharf.
平均大潮高潮潮高称（）。A、大潮B、小潮C、大潮升D、小潮升
单选题The tide is（）.A blackB settingC beingD having
单选题Rising tides of unemployment claims across the state has led the governor to declare the economy to be in a state of emergency.A Rising tidesB Because the rising tideC The tide is risingD The rising tideE The rising of the tide
单选题From （） the mariner can know the data of tide．A the Sea PilotB the Cargo PlanC the Tide TableD the Port List
