Question

17．There are thousands of coral reefs（珊瑚礁） in the world； Unfortunately，however，they are now in serious danger．More than one-third are in such bad shape that they could die within ten years．（36）BHere are the three main causes discovered．
The first cause is pollution on land．The pollutants run with rainwater into rivers and streams，which carry the poisons into the ocean．（37）ESo they will be easily infected（感染） with diseases．
   （38）AHigher ocean temperatures kill the important food source（來(lái)源） for the coral-the algae，the tiny greenish-gold water plants that live on coral．（39）GThis process has happened more and more frequently in recent years．
The last factor contributing to the disappearance of coral reefs is people．People sometimes crash into reefs with their boats，breaking off large blocks of coral．（40）CMoreover，some people even break coral off to collect for souvenirs since it is so colorful and pretty．
 
A．Global warming is another reason．
B．Many might not even last that long!
C．Divers who walk on reefs can also do serious damage．
D．Reefs provide a home for 25% of the fish in the ocean．
E．Chemicals from the poisons kill reefs or make them weak．
F．Steps must be taken now to stop over-fishing and pollution of the oceans．
G．When the algae die，the coral loses its color and it also dies in the end．

Answer 1

分析 本文主要介紹了珊瑚礁正處于嚴(yán)重的危險(xiǎn)中，有的可能在未來(lái)十幾年中就死亡了．文章講述了引起珊瑚礁死亡的三個(gè)主要原因：1、土地污染；2、全球變暖；3、人為因素．

解答 36．B細(xì)節(jié)理解題．前面說(shuō)they are now in serious danger．More than one-third are in such bad shape that they could die within ten years．后面說(shuō)Here are the three main causes discovered．珊瑚礁現(xiàn)在正處于嚴(yán)重的危險(xiǎn)中，超過(guò)1/3的可能在十年內(nèi)死亡．由此推知，該處講的是許多甚至可能不會(huì)持續(xù)那么久．故選B．
37．E段落大意題．本段主要介紹了有毒物質(zhì)對(duì)珊瑚礁的危害．故選E．
38．A段落大意題．本段主要介紹了海洋溫度的上升對(duì)珊瑚礁的影響．由此推知，該處講的是全球變暖是另一個(gè)原因．故選A．
39．G邏輯推理題．前面說(shuō)Higher ocean temperatures kill the important food source（來(lái)源） for the coral-the algae，the tiny greenish-gold water plants that live on coral．較高的海洋溫度殺死令了珊瑚的重要食物來(lái)源--珊瑚藻．后面說(shuō)This process has happened more and more frequently in recent years．這個(gè)過(guò)程在近年里發(fā)生的越來(lái)越頻繁．由此推知，該處講的是當(dāng)海藻死了，珊瑚最后也會(huì)死．故選G．
40．C段落大意題．本段主要介紹了人為因素對(duì)珊瑚礁的影響．故選C．

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