18．A new report says sea ice in the Arctic Ocean is melting more quickly than expected．American scientists say the ice is melting even faster than computer programs had estimated．
Scientists know that climate change has a major effect on the Arctic Ocean partly because sea ice is disappearing．They also know that areas of open seawater are expanding．Such areas are known to take in sunlight and increase temperatures．Scientists say this has helped to cause the loss of the Arctic's ice cover．
For the study，the American scientists compared eighteen computer programs with observations made by satellites and other instruments．The Intergovernmental Panel on Climate Change used the computer programs to prepare its 2007estimates of climate change．
The computer programs gave estimates of the amount of ice in the Arctic Ocean in the month of September．September is when the Arctic has the least ice，after the warm，summer months．The computer estimates suggested an ice loss of two and a half percent for every ten-year period between 1953and 2006．
Newer studies of the Arctic have used information gathered by aircraft，satellites and ships．This information showed a loss of September ice cover of almost eight percent for every ten-year period between 1953and last year．This means the ice is disappearing about thirty years faster than the computer programs estimated．
The scientists say the programs might not have recognized the full effect of increased carbon dioxide and other gases in Earth's atmosphere．They say their study suggests the gases may have more of an effect than had been thought．
66．It is reported that sea ice in the Arctic Ocean is melting more quickly than expected mainly becauseB．
A．sea ice's disappearance B．climate change
C．seawater's expansion D．the loss of the Arctic's ice cover
67．How did the scientists draw the conclusion that sea ice in the Arctic Ocean is melting more quickly than expected？A
A．The scientists have compared the computer programs with observation made by satellites and other instruments．
B．The scientists have found that the seawater take in sunlight and increase temperatures
C．The scientists have figured out many numbers with the help of computer．
D．The scientists have been observing the Arctic Ocean for many years．
68．If the ice melts at the present speed，by the end of this century the ice loss in the Arctic Ocean will beD according to newer studies．
A．22.5% B．35% C．72% D．100%
69．Which of the following is TRUE according to the passage？C
A．The figures of the computer estimates are wrong．
B．Scientists study climate change through studying sea level．
C．Newer studies show gases may have more effect on sea ice in the Arctic Ocean．
D．The ice is melting even faster than satellites have estimated．
70．This report mainly warns human toC．
A．prevent the sea ice in the Arctic Ocean from melting any more
B．pay more attention to the loss of the Arctic's ice cover
C．take necessary steps to protect the environment of our earth
D．stop summer sea ice in the Arctic from disappearing so fast．
分析 文章介绍了北冰洋的浮冰正在加速融化，主要受气候变化和气体的影响．本文属于环保类文章，作者旨在呼吁人们保护环境．
解答 66---70 BADCC
66．答案B．细节理解题．根据第二段Scientists know that climate change has a major effect on the Arctic Ocean partly because sea ice is disappearing可知，冰川融化主要是受气候变化的影响．故选B．
67．答案A．细节理解题．根据第三段the American scientists compared eighteen computer programs with observations made by satellites and other instruments可知，科学家通过比较卫星或其他工具收集的电脑数据得出的结论．故选A．
68．答案D．数字计算题．根据第四段This information showed a loss of September ice cover of almost eight percent for every ten-year period between 1953and last year可知，最新的研究表明，自1953年开始，每10年有8%的冰川在消失，故完全消失的话大约要用130年，约在2038年完全消失．故本世纪末，冰川已完全消失．答案选D．
69．答案C．细节理解题．根据最后一段They say their study suggests the gases may have more of an effect than had been thought可知，气体对冰川的影响比我们想象中要大得多．故选C．
70．答案C．主旨大意题．根据全文可知，文章介绍了北冰洋的浮冰正在加速融化，主要受气候变化和气体的影响．本文属于环保类文章，作者旨在呼吁人们保护环境．故选C．
点评 报道类文章一般由标题（Head line），导语（Introduction），背景（Back ground），主体（Main body）和结尾（End）五部分构成．标题是文章中心思想高度而又精辟的概括，但根据历年的高考情况来看，这类阅读理解材料一般不给标题，而要同学们选择标题．导语一般位于整篇文章的首段．背景交待一个事实的起因．主体则对导语概括的事实进行详细叙述，这一部分命题往往最多，因此，阅读时，同学们要把这部分作为重点．结尾往往也是中心思想的概括，并与导语相呼应，命题者常在此要设计一道推理判断题．在进行推理判断时，同学们一定要以阅读材料所提供的科学事实为依据，同时所得出的结论还应符合基本的科普常识．
