题目内容

9.All too often,a choice that seems sustainable(可持续的)turns out on closer examination to be problematic.Probably the best example is the rush to produce ethanol(乙醇) for fuel from corn.Corn is a renewable resource-you can harvest it and grow more,almost limitlessly.So replacing gas with corn ethanol seems like a great idea.
One might get a bit more energy out of the ethanol than that used to make it,which could still make ethanol more sustainable than gas generally,but that's not the end of the problem.Using corn to make ethanol means less corn is left to feed animals and people,which drives up the cost of food.That result leads to turning the fallow land-including,in some cases,rain forest in places such as Brazil-into farmland,which in turn gives off lots of carbon dioxide (CO) into the air.Finally,over many years,the energy benefit from burning ethanol would make up for the forest loss.But by then,climate change would have progressed so far that it might not help.
You cannot really declare any practice"sustainable"until you have done a complete life-cycle analysis of its environmental(环境的) costs.Even then,technology and public keep developing,and that development can lead to unforeseen and undesired results.The admirable goal of living       sustainably requires plenty of thought on an ongoing basis.

57.What might directly cause the loss of the forest according to the text?C
A.The growing demand for energy to make ethanol
B.The increasing carbon dioxide in the air
C.The greater need for farmland
D.The big change in weather.
58.The underlined word"it"in the second paragraph refers to"A"
A.the energy benefit                  
B.the forest loss
C.climate change                    
D.burning ethanol
59.The author thinks that replacing gas with corn ethanol isA.
A.impractical            
B.acceptable        
C.admirable         
D.useless
60.What does the author mainly discuss in the text?B
A.Technology     
B.Sustainability   
C.Ethanol energy    
D.Environmental protection.

分析 作者主要谈论的是可持续性发展的判断依据以及用相关的一些事实来进行论证其论点.

解答 57---60 CAAB
57.C.推理判断题.根据第二段的That result leads to turning the fallow land-including,in some cases,rain forest in places such as Brazil-into farmland这个结果会导致一些休耕土地,在一些情况下,包括位于巴西等地的热带雨林,变为农田.所以直接造成森林损失的是农田的需求量大,故选C.
58.A.词义猜测题.根据Finally,over many years,the energy benefit from burning ethanol would make up for the forest loss.But by then,climate change would have progressed so far that it might not help.最后,多年来,燃烧乙醇所带来的能源效益将弥补森林的损失,但到那时为止,气候变化将发展到目前为止,它可能不会有帮助.可知it指代上文的the energy benefit 意为能源效益,故选A.
59.A.推理判断题.根据第一段So replacing gas with corn ethanol seems like a great idea.所以用玉米乙醇代替天然气似乎是个好主意.和全文可知作者认为用玉米乙醇代替天然气是不符合实际的,会带来很多意想不到的问题,故选A.
60.B.主旨大意题.纵观全文我们可以知道,作者主要谈论的是可持续性发展的判断依据以及用相关的一些事实来进行佐证其论点.故选B.

点评 本文是科教类阅读,考查学生对细节的理解把握和推理判断能力,做题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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