問題詳情

Passage 2    Coral reefs are dying around the world. In particular, coral mining, pollution, digging of canals, and accessingislands and bays pose serious 21 to their fragile ecosystems. Coral reefs also face high dangers from diseases,22 fishing practices and warming oceans. In order to find answers to these problems, researchers study thevarious factors that impact reefs. The list of factors is long, 23 the ocean's role as a carbon dioxide sink,atmospheric changes, ocean acidification, viruses, algal blooms and others. Reefs are threatened well beyond coastalareas.    Estimates assembled from coral reef specialists from around the world 24 that 19% of the coral reefhabitat has already been destroyed, and that a further 17% is likely to be lost over the subsequent 10–20 years. Only46% of the world’s reefs can be regarded as being in good health. About 60% of the world's reefs may be at risk due todestructive, human-related activities. The threat to the health of reefs is particularly alarming in Southeast Asia, where80% of the reefs are endangered. By the 2030s, 90% of reefs are expected to be 25 from both human activitiesand climate change; by 2050, all coral reefs will be endangered.
21.
(A) effects
(B) increments
(C) solutions
(D) threats

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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