Question

10．Coral reefs
       For millions of years，coral reefs have provided homes and food for thousands of different living things．Fish and sea birds share the reef with other sea creatures．Now these beautiful places are in danger．（36）CScientists have found that people and pollution have ruined more than one-fourth of the earth's coral reefs．Unless things change，all of the remaining reefs may die within your lifetime．
       Some people think that coral is stone because of its rough，hard surface．But coral is an animal!Tiny polyps （水螅體） form the coral reefs．（37）AThese colours come from the algae （海藻）  living inside the coral．Billions of coral polyps stick together．New ones grow on the dead corals．This happens year after year．Over time，the coral builds up a reef．The reef rises from the ocean floor until it almost reaches the sea's surface．It takes coral 500，000 years to build a huge reef．（38）FThe coral reefs have been harmed in different ways．People have broken off pieces of coral．They wanted to sell or keep them．To catch more fish，people have dropped sticks of dynamite （炸藥） into the water．（39）EWater pollution has encouraged overgrowth of the sea plants that grow near coral reefs．They block out the sunlight that the algae need．（40）DWarm water kills the algae．When the algae die，the coral loses both its food and its color．The coral turns white and dies．Scientists call this coral bleaching （珊瑚白化）．The bleached part of the coral reef cannot recover．

A．They come in many colours．
B．This has blown up parts of the reefs．
C．So are all the sea plants and animals that depend on them．
D．The worst problem is the heating up of the world's oceans．
E．Coral reefs are experiencing a rapid increase in most locations．
F．However，it has taken human beings less than 100 years to destroy the reefs．
G．They cover less than 1% of the ocean floor，but support about 25% of sea creatures．

Answer 1

分析 本文介紹了珊瑚礁的形成過程，面臨的危險以及常規(guī)破壞的方式，我們要保護環(huán)境保護我們生存的資源．

解答 C A F E D
36．C 上下文理解．根據(jù)前句Now these beautiful places are in danger．可知，現(xiàn)在這些美麗的珊瑚都處于危險之中，那么很自然其他賴以生存的生物都在危險中，故選C．
37．A 概括總結(jié)．根據(jù)These colours come from the algae （海藻）  living inside the coral這些顏色來自于體內(nèi)的海藻顏色，所以前句應(yīng)該也提到珊瑚的顏色問題，故選A．
38．F 上下文語境．前句提到It takes coral 500，000 years to build a huge reef形成珊瑚礁需要50萬年的時間，但是人類破壞只要不到100年的時間，而且后句也提到The coral reefs have been harmed in different ways．所以F起到承上啟下的作用，故選F．
39．E 上下文語境．根據(jù)后句Water pollution has encouraged overgrowth of the sea plants that grow near coral reefs．水污染讓珊瑚礁附近的植物瘋狂生長，暗示選項E符合語境．
40．D 上下文語境．根據(jù)后句Warm water kills the algae．熱水殺死這些海藻，所以前句the heating up也暗示選項 符合題意，故選D．

點評 本文是一篇選句填空閱讀，題目主要考查上下文內(nèi)容聯(lián)系以及文章內(nèi)容理解．做題時學(xué)生應(yīng)仔細閱讀原文，把握文章主要內(nèi)容，聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義，從中選出正確答案，一定要做到有理有據(jù)，切忌胡亂猜測