四六级考试

【单选题】Climate change has brought about such problems as bleaching-induced (47)______ of corals. Bleaching occurs when corals are stressed by high temperature or other (48)______ changes, and lose their symbiotic algal cells. When they lose these cells, which provide the corals with essential (49)______ and give them their color, they can die. Reefs are important for livelihoods, and fisheries and tourism, and are the main (50)______ along the easternAfrican coast as well as (51)______ 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 inAfrica-where we (52)______ in a well-protected reef.But over the years, that reef has been completely devastated by the bleaching. It was truly (53)______ 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 (54)______ 70 percent of the reefs of the region. Through a regional task force, a coral reef strategy with an emphasis on MPAs is (55)______ under development.Countries in the region are also involved in a (56)______ reef research project to better understand the impacts of coral bleaching.A、depressedI) doveB、nutrientsJ) depressingC、devastatedK) mortalityD、morality L) availableE、environmental M) currentlyF) globally-targeted N) gloomilyG) desperately O) fringing H) ecosystem
网考网参考答案：I
网考网解析：
根据文章结构，此处应该填入一个动词过去式，dove符合题意，故选I)。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>