2. 外语
  3. Climate change has brought about such problems as bleaching-induced【S1】______of corals. Bleaching occurs when corals axe stresse

Climate change has brought about such problems as bleaching-induced【S1】______of corals. Bleaching occurs when corals axe stresse

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问题     Climate change has brought about such problems as bleaching-induced【S1】______of corals. Bleaching occurs when corals axe stressed by high temperature or other【S2】______changes, and lose their symbiotic algal cells. When they lose these cells, which provide the corals with essential【S3】______and give them their color, they can die. Reefs are important for livelihoods, and fisheries and tourism, and are the main【S4】______along the eastern African coast as well as【S5】______many of the islands of the Western Indian Ocean.
    In college during the ’70s, I joined an expedition to the Malindi Marine Park-one of the first MPAs (marine protected areas) to be established in Africa-where we【S6】______in a well-protected reef. But over the years, that reef has been completely devastated by the bleaching. It was truly【S7】______to see such a vibrant and healthy reef reduced almost to the status of an unprotected one.
    Recently, coral reefs have received a great deal of attention, especially following the 1997/ 1998 bleaching event that【S8】______70 percent of the reefs of the region. Through a regional task force, a coral reef strategy with an emphasis on MPAs is【S9】______under development. Countries in the region are also involved in a【S10】______reef research project to better understand the impacts of coral bleaching.

A) depressed            B) nutrients              C) devastated             D) morality
E) environmental        F) globally-targeted      G) desperately            H) ecosystem
I) dove                 J) depressing             K) mortality              L) available
M) currently            N) gloomily               O) fringing
【S4】
选项
答案H
解析 根据文意，暗礁对于生活、渔业以及旅游业来说是很重要的，它是东非海岸主要的生态系统，同时也给印度洋西部岛屿镶了一道边。名词ecosystem意思是生态系统，符合题意，故选H)。
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大学英语四级

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