19．Coral reefs（珊瑚礁）are not just beautiful to look at，but also very useful．They shelter nearly
25% of ocean life and provide food for billions of people．However，like many other species，this amazing ecosystem（生態(tài)系統(tǒng)）is in danger of dying out!
There are two main reasons for the destruction-the rising carbon dioxide levels caused by global warming as well as human influences like bottom operation．While not much can be done about the former，the loss caused by the latter can be reduced．
Bottom operation involves dropping nets to the ocean bed and then dragging them up when filled with fish．This action damaged the ocean floor，causing the coral branches to separate from the reefs．While that is very discouraging，the good news is that if these branches are found quickly，they can be saved．At present，that work is being performed by volunteer divers．But the method has only limited success because they cannot stay long underwater，nor reach depths of over 200meters where some of the deep-sea coral grows．
However，this is not the case for Coralbots-the robots that can constantly seek out broken branches．A team of‘coralbots'，each individually working to simple rules will piece together damaged bits of coral，allowing them to regrow．They are programmed to be able to distinguish between other things and the coral．The robots work together in groups，similar to bees．If one coralbot is damaged then the others will still be able to complete the task．
Dr Lea-Anne Henry said："The project of using coralbots offers us the possibility to restore（修復）the function of reefs．It is in the final stage of testing．Once ready，the researchers hope to build hundreds of them and use them effectively in the waters off Scotland and then hopefully in the oceans across the world．"
32．Which of the following is a cause of the danger that coral reefs are facing？D
A．The appearance of new creatures．
B．The seriously polluted sea water．
C．The activities of volunteer divers．
D．Human activities like bottom operation．
33．Compared with volunteer divers，coralbotsA．
A．can stay longer underwater B．must work as bees do
C．can distinguish what is coral D．can never be damaged
34．What does the underlined word"them"in the last paragraph refer to？A
A．Coralbots B．Broken branches C．working bees D．Bits of coral
35．We can infer from the passage thatB．
A．bottom operation has affected most underwater creatures
B．broken branches of coral can regrow if saved in time
C．hundreds of the coralbots have worked well in the oceans
D．with the coralbots all damaged coral reefs can be restored．
分析 本文主要講述了珊瑚礁所面臨的問題以及應對的方法．珊瑚礁由于全球變暖以及人類的影響而面臨著滅絕的危險．潛水員不能長時間的待在水里對珊瑚礁進行修復，但是Coralbots，它們可以不斷地尋找斷枝，幫助受損的珊瑚礁重新生長．
解答 DAAB
32．D 細節(jié)理解題．由第二段There are two main reasons for the destruction-the rising carbon dioxide levels caused by global warming as well as human influences like bottom operation．可知有兩個原因導致珊瑚礁面臨滅絕，一個是全球變暖，另一個是人類影響像海底操作，故選D．
33．A 細節(jié)理解題．由第三段But the method has only limited success because they cannot stay long underwater，nor reach depths of over 200 meters where some of the deep-sea coral grows．可知志愿者不能長時間呆在水下；由第四段However，this is not the case for Coralbots-mthe robots that can constantly seek out broken branches可知Coralbots可以長時間呆在水下，故選A．
34．A 詞語辨析題．由最后一段 use them effectively in the waters off Scotland and then hopefully in the oceans across the world．可知這里的them指代的是上文提到的Coralbots，故選A．
35．B 推理判斷題．由第三段the good news is that if these branches are found quickly，they can be saved．可知珊瑚礁的分支如果被及時發(fā)現(xiàn)，就可以重新生長，故選B．
點評 學生需要認真閱讀原文，把握文章大意，對文章脈絡有整體的了解，能仔細查找文中細節(jié)，并能根據(jù)文章內容進行合理的推測判斷．
