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 （水螅体） 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 （炸药） 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 本文介绍了珊瑚礁的形成过程，面临的危险以及常规破坏的方式，我们要保护环境保护我们生存的资源．

解答 C A F E D
36．C 上下文理解．根据前句Now these beautiful places are in danger．可知，现在这些美丽的珊瑚都处于危险之中，那么很自然其他赖以生存的生物都在危险中，故选C．
37．A 概括总结．根据These colours come from the algae （海藻）  living inside the coral这些颜色来自于体内的海藻颜色，所以前句应该也提到珊瑚的颜色问题，故选A．
38．F 上下文语境．前句提到It takes coral 500，000 years to build a huge reef形成珊瑚礁需要50万年的时间，但是人类破坏只要不到100年的时间，而且后句也提到The coral reefs have been harmed in different ways．所以F起到承上启下的作用，故选F．
39．E 上下文语境．根据后句Water pollution has encouraged overgrowth of the sea plants that grow near coral reefs．水污染让珊瑚礁附近的植物疯狂生长，暗示选项E符合语境．
40．D 上下文语境．根据后句Warm water kills the algae．热水杀死这些海藻，所以前句the heating up也暗示选项 符合题意，故选D．

点评 本文是一篇选句填空阅读，题目主要考查上下文内容联系以及文章内容理解．做题时学生应仔细阅读原文，把握文章主要内容，联系文章上下文内容并结合所给选项含义，从中选出正确答案，一定要做到有理有据，切忌胡乱猜测