维A 完形填空(每题1.5分，满分30分)

　　选材相似度：★★★★

　　设题相似度：★★★

　　难度系数：★★★★

　　Being surrounded by sharks may sound like a

　　bad thing，but scientists say sharks are actually a good sign of ocean health.__1__ knowing that，Enric Sala，a marine

　　ecologist and National Geographic Fellow，was a little

　　__2__ when he first dived at Kingman Reef，the heart of a massive，newly

　　__3__

　　area south of Hawaii now called the Pacific

　　Remote Islands Marine National Monument.

　　“The

　　__4__

　　time I jumped in the water，as soon as the bubbles

　　__5__，my heartbeat doubled—there were a dozen

　　sharks swimming around us and so

　　__6__

　　corals on the bottom

　　that there was not even

　　__7__

　　for sand between them，” says

　　Sala.

　　Sala led a series of

　　__8__

　　to the region's coral reefs over the past several years，__9__

　　part of his work at the Scripps Institution of Oceanography in La Jolla，Calif.His team's

　　__10__

　　about sharks and corals there helped

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