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发布时间：2006-07-01 08:12     点击：

B. Cost-efficient microbial fuel cells. 

C. The efficiency of microbial fuel cells. 

D. Organic battery runs robot. 

42. Chris Melhuish and technlogists are trying to use household wastes to _________. 

A. feed domestic animals. 

B. make garden compost 

C. produce electricity 

D. manufacture bacteria 

43. The word “redox”in paragraph 4 most probably means ___________ . 

A. reduction and oxidation reaction  

B. electron from the hydrogen atoms  

C. bacteria-driven battery  

D. a colony of E. Coli bacteria 

44. Earlier MFCs were inefficient because they _________ . 

A. produced very little electricity 

B. required different anode materials 

C. consumed much energy on filters and pumps 

D. could only run domestic appliances 

45. According to Melhuish, his present MFC ___________ . 

A. is of very little use right now 

B. is no more efficient than previous ones 

C. consumes a lot of organic materials 

D. is already considerably efficient

Passage Four 

　　The appalling carnage(大屠杀) in Bali means airlines are once again bracing themselves for hard times. Yet if 11 September is a guide, any slump (暴跌) in air travel will be a blip. 

　　Global air traffic has quadrupled since 1970 and is forecast to more than double again by 2015. Result? Air transport is the fastest growing source of greenhouse gas emissions. Though only 3.5 per cent at present, aviation’s share of emissions could exceed 10 percent by 2050. So what are governments and international bodies doing? Precious little. 

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