题目内容

20.As warming continues,scientists warn the oxygen content of oceans across the planet could be more and more reduced,with serious consequences for the future of fish and other sea life.
(36)B One is the simple fact that as water gets warmer,it can hold less dissolved(溶解的) oxygen.The other reason is less obvious.The entire ocean gets its oxygen from the surface-either from the atmosphere,or from photosynthesizing algae(进行光合作用的藻类) floating at the top of the sea.(37)D
Global warming is expected to reduce the mixing of the ocean by making surface seawater lighter.That's because in a warmer world we can expect more rainfall and more melting(融化)of glaciers,icebergs,and ice sheets.(38)C The extra heat from the warming atmosphere will also make surface water expand and thus make it lighter still.(39)F Instead,more of the oxygen will remin near the surface,where it will be used up by oxygen-breathing organisms.
A low-oxygen ocean may become an inescapable feature of our planet.A team of Danish researchers wondered how long oxygen levels would drop if we could somehow reduce our carbon dioxide emissions to zero by 2100.They determined that over the next few thousand years oxygen levels would continue to fall,until they declined by 30percent.The oxygen would slowly return to the oceans,but even 100,000years from now they will not have fully recovered.(40)G

A.It's not known why the oxygen level of oceans has reduced.
B.Scientists point to two reasons to expect a drop in ocean oxygen.
C.Fresh water's inpouring will make the water at the ocean's surface lighter.
D.The oxygen then spreads to the deep ocean as the surface water slowly sinks.
E.Global warming has caused the reduction of the oxygen content of oceans worldwide.
F.The light surface water will be less likely to sink so the deep ocean will get less oxygen.
G.If they are right,we have every reason to worry about the major effect it has on sea life.

分析 本文主要介绍了科学家们认为,随着气候变暖,地球上海洋中的氧含量可能会越来越低,对鱼类和其他海洋生物的未来产生严重后果.科学家们指出有两个原因导致海洋氧的含量下降,其中一个原因是水的温度上升,溶解的氧气越来越少.

解答 36-40:BDCFG
36.B文章衔接题.根据后文One is the simple fact that as water gets warmer,一个简单的事实是水变得越来越热;及The other reason is less obvious.另一个原因不是很明显.B项:Scientists point to two reasons to expect a drop in ocean oxygen.科学家们指出有两个原因导致海洋氧的含量下降.符合文意,故选B.
37.D联系上文题.根据上文The entire ocean gets its oxygen from the surface-either from the atmosphere,or from photosynthesizing algae(进行光合作用的藻类) floating at the top of the sea.整个海洋的表面从大气中获取氧气,或漂浮在海面上的藻类吸收氧进行光合作用.D项:The oxygen then spreads to the deep ocean as the surface water slowly sinks.随着地表水慢慢下沉,氧气便扩散到深海.符合文意,故选D.
38.C语境辨析题.根据上文Global warming is expected to reduce the mixing of the ocean by making surface seawater lighter.可知全球变暖预期通过使表面海水淡化来减少海洋的混合.C项:Fresh water's inpouring will make the water at the ocean's surface lighter.新鲜水的注入将会使海洋表面的水淡化.符合文意,故选C.
39.F文章衔接题.根据后文Instead,more of the oxygen will remin near the surface,where it will be used up by oxygen-breathing organisms.可知相反,更多的氧气会聚集在表面附近,在那里它将通过生物的有氧呼吸被利用.F项:The light surface water will be less likely to sink so the deep ocean will get less oxygen.浅表层的水不太可能下沉,深海会得到更少的氧气.符合文意,故选F.
40.G联系上文题.根据前文提到了丹麦研究人员的一些假定.G项:If they are right,we have every reason to worry about the major effect it has on sea life.如果他们是对的,我们完全有理由担心它对海洋生物造成的重大影响.符合文意,故选G.

点评 答题前一定要略读全文,把握文章要表达的主题,注意前后句与句,段落与段落之间的关系.答题中,一定要认真分析,注意选项与上下文的关系,与前后单词的关系.对于一时没有太大的把握的题可以放到最后再来完成,因为有时答案可以从下文内容体现出来.答完后再通读一遍文章,看看所选选项能不能是语句通顺,语意连贯.

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