问答题《复合题被拆开情况》 Coral reefs, sometimes called rainforests of the sea, make up only 0.1％ of the ocean floor, but they are home of the world’s fish. Reefs grow in tropical waters. The largest is Australia’s Great Barrier Reef, which is over 1,200 miles long off the Queensland coast. Reefs are not only important for food; they are also valuable for tourism. For example, Florida’s reef is worth about $63 billion every year in tourism. Unfortunately, the consequences of increased human activity are damaging reefs around the world.

【正确答案】Building resorts and ports.

【答案解析】文章第二段第三、四句提到，“像浮潜和潜水这样的活动，以及船上的石油泄漏，都可能破坏珊瑚礁。但与建设度假村和港口的影响相比，这是相当小的”。也就是说，建设度假村和港口对珊瑚礁的破坏最严重。由此可知本题答案。