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.a(chǎn)nd 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 (泥漿)"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 本文介紹了一項發(fā)明.科學(xué)家們發(fā)現(xiàn)一種微生物的燃料細(xì)胞能夠直接從廢水里產(chǎn)生電能,這個新方法在產(chǎn)生大量的電能的同時,還可以有效的凈化廢水.這項發(fā)明對世界有影響,節(jié)約大量的錢財,提供更好的污水處理并且提高能源的永續(xù)性.它能有效的處理廢水,對環(huán)境沒有任何的危害.

解答 47-50BAAD
47.B.細(xì)節(jié)題.根據(jù)第三段末The new approach would produce significant amounts of electricity while effectively cleaning the wastewater可知這個新方法在產(chǎn)生大量的電能的同時,還可以有效的凈化廢水.所以答案是B.Through it more electricity can be created and water can be cleaned better.
48.A.推理判斷題..根據(jù)第四段末Professor Liu 所說的"This could have an impact around the world,save a great deal of money,provide better water treatment and promote energy sustainability."可知這項發(fā)明對世界有影響,節(jié)約大量的錢財,提供更好的污水處理并且提高能源的永續(xù)性,所以他對這項發(fā)明的態(tài)度是支持的,因此答案是A.其他選項的含義是B"批判的";C"不關(guān)心的";D"好奇的".
49.A.細(xì)節(jié)題.根據(jù)末段的.It treats the wastewater more effectively,and doesn't have any of the environmental drawbacks of that technology,可知它能有效的處理廢水,對環(huán)境沒有任何的危害,所以答案是A.Because it is co-friendly and treats wastewater more effectively.
50.D.主旨大意題.根據(jù)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可知這種微生物的燃料細(xì)胞能夠直接從廢水里產(chǎn)生電能,而后文是對這項發(fā)明的特點(diǎn),所以答案是D.Microbial fuel cells will produce more electricity from wastewater.

點(diǎn)評 考查科技類閱讀.
歸納概括題的做法:
適合這類題型的閱讀理解通常具體反映在文章的題目或一段短文的小標(biāo)題上;很多文章從一開頭就直接說出觀點(diǎn),表達(dá)中心思想.所以對于這類題型,一定要提示學(xué)生注意主題句和主題段,絕大多數(shù)的短文類似于語文的老三段,注意段與段之間的聯(lián)系,注意隱藏的中心思想,準(zhǔn)確了解文章結(jié)構(gòu),把握句與句之間的關(guān)系,注重邏輯關(guān)系,把握住文章的脈絡(luò)即可.

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