题目内容
The Great Barrier Reef is one of the seven recognized wonders of the natural world.
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The reef attracts one million visitors each year.
Agriculture, together with cattle ranches, fish farms, large coastal cities and tourism, has an impacts on the reef system
Towns and cities along much of the Queenland coast are not washed into the Pacific Ocean beacause the reef protect them.
淋巴造血系统不包括下列哪项
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