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9.CORVALIJS.Ore.--Engineers at Oregon Suite University have made a breakthrough in the performance of microbial (微生物的)fuel cells that can produce electricity directly from wastewater.opening the door to a future in which waste treatment plants not only will power themselves,but will sell extra electricity.
The new technology developed at OSU; can now produce 10to 50more times the electricity,per volume,than most oilier approaches using microbial fuel cells.and 100times more electricity than some.
Researchers say this could eventually change the way that wastewater is treated all over the world,replacing the widely used"activated sludge (泥浆)"process that has been in use tor almost a century.The new approach would produce significant amounts of electricity while effectively cleaning the wastewater,
"If this technology works on a commercial scale the way we believe it will,the treatment of wastewater could be a huge energy producer,not a huge energy cost?,said Hong Liu,an associate professor in the OSU Department of Biological and Ecological Engineering."This could have an impact around the world,save a great deal of money,provide better water treatment and promote energy sustainability."
The biodegradable (能降解的)characteristics of wastewater,if developed to their full potential,could theoretically provide many times the energy that is now being used to process them,with no additional greenhouse emissions.
OSU researchers reported several years ago on the promise of this technology,but at that time the systems in use produced far less electrical power.With new concepts,the technology can now produce more than two kilowatts per cubic meter of liquid reactor volume.
The new system also works better than an alternative approach to creating electricity from wastewater,based on anacrobic (臭氧的)digestion that produces methane (甲烷).It treats the wastewater more effectively,and doesn't have any of the environmental drawbacks of that technology,such as production of possible release of methane,a significant greenhouse gas.

47.What can we learn about the new technology from the passage?B
A.It can produce 100limes more electricity than any approach used today.
B.Through it more electricity can he created and water can be cleaned better.
C.It has already changed the way that wastewater is treated all over the world
D.It has opened the door to put microbial fuel cells to productive use.
48.What attitude does Professor Liu hold towards the new technology?A
A.Supportive.
B.Critical.
C Unconcerned.
D.Curious.
49.According to the last paragraph,why does the new system work better than the alternative approach?A
A.Because it is co-friendly and treats wastewater more effectively.
B.Because it can make lull use of anaerobic digestion producing methane.
C.Because it may produce less methane than the alternative approach.
D.Because it can produce 10limes the energy than the alternative approach.
50.Which of the following best expresses the main idea of the passage?D
A.The treatment of wastewater is a huge energy cost.
B.Wastewater is being treated differently over the world.
C.Waste treatment plants have found a new way to power themselves.
D.Microbial fuel cells will produce more electricity from wastewater.

分析 本文介绍了一项发明.科学家们发现一种微生物的燃料细胞能够直接从废水里产生电能,这个新方法在产生大量的电能的同时,还可以有效的净化废水.这项发明对世界有影响,节约大量的钱财,提供更好的污水处理并且提高能源的永续性.它能有效的处理废水,对环境没有任何的危害.

解答 47-50BAAD
47.B.细节题.根据第三段末The new approach would produce significant amounts of electricity while effectively cleaning the wastewater可知这个新方法在产生大量的电能的同时,还可以有效的净化废水.所以答案是B.Through it more electricity can be created and water can be cleaned better.
48.A.推理判断题..根据第四段末Professor Liu 所说的"This could have an impact around the world,save a great deal of money,provide better water treatment and promote energy sustainability."可知这项发明对世界有影响,节约大量的钱财,提供更好的污水处理并且提高能源的永续性,所以他对这项发明的态度是支持的,因此答案是A.其他选项的含义是B"批判的";C"不关心的";D"好奇的".
49.A.细节题.根据末段的.It treats the wastewater more effectively,and doesn't have any of the environmental drawbacks of that technology,可知它能有效的处理废水,对环境没有任何的危害,所以答案是A.Because it is co-friendly and treats wastewater more effectively.
50.D.主旨大意题.根据首段Engineers at Oregon Suite University have made a breakthrough in the performance of microbial (微生物的)fuel cells that can produce electricity directly from wastewater可知这种微生物的燃料细胞能够直接从废水里产生电能,而后文是对这项发明的特点,所以答案是D.Microbial fuel cells will produce more electricity from wastewater.

点评 考查科技类阅读.
归纳概括题的做法:
适合这类题型的阅读理解通常具体反映在文章的题目或一段短文的小标题上;很多文章从一开头就直接说出观点,表达中心思想.所以对于这类题型,一定要提示学生注意主题句和主题段,绝大多数的短文类似于语文的老三段,注意段与段之间的联系,注意隐藏的中心思想,准确了解文章结构,把握句与句之间的关系,注重逻辑关系,把握住文章的脉络即可.

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