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根据以下资料，回答11~15题。 2010年全国水产养殖面积比上年增长4.97%。其中，海水养殖面积2080.88
千公顷，占水产养殖总面积的27.21%，比上年增长11.92%；淡水养殖面积5564.34千公顷，占水产养殖总面积的72.79%，比上年增长2.59%。 海水养殖面积：鱼类养殖面积为78.51千公顷，比上年降低5.65%；甲壳类养殖面积310.78千公顷，比上年增长2.60%；贝类养殖面积1308.00千公顷，比上年增长13.35%；藻类养殖面积120.20千公顷，比上年增长8.68%。 淡水养殖面积：池塘养殖面积2377.01千公顷，比上年增加45.1千公顷，增长1.93%；水库养殖面积1795.58千公顷，比上年增加69.17千公顷，增长4.O1%；湖泊养殖面积1007.10千公顷，比上年增加8.87千公顷，增长0.89%；河沟养殖面积264.13千公顷，比上年增加14.45千公顷，增长5.79%；其他养殖面积120.53千公顷，比上年增加2.92千公顷，增长2.48%；稻田养成鱼面积1326.11千公顷，比上年减少13.60千公顷，降低1.02%。 2009年全国海水养殖面积占水产养殖总面积的比重为（）。 A．25.5% B．27.5% C．28.3% D．29.2%
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