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3.When the Audet family turns on the lights at Blue Farm,they are using electricity that comes from cows-cow manure (粪肥),to be specific.
Cows produce a lot of wastes.One cow can create 30gallons of wastes each day.Now imagine the output of over 1,000cows at Blue Farm.That's really a big amount.
When farmers clean their barns,they put the wastes in a big heap,and spread some of them on their fields for fertilizer(肥料).But now places like Blue Spruce Farm have a new way of using cow wastes.They use them to produce electricity.
Here's how it works:A big machine moves back and forth cleaning the barn floor."The cows aren't bothered,"says Marie Audet."They are animals of habit; they get used to it,and just lift one foot and then another to let it go by."
The machine pushes the manure into a big 600-gallon tank like a small swimming pool.The tank is called a digester (化粪池) because what happens there is just like what happens inside a cow:Bacteria(细菌) get to work and continue to digest the manure.
Methane gas (甲烷、沼气)in the atmosphere is known as a"greenhouse"gas because it keeps heat just like a greenhouse does,causing our planet to warm up.That's an environmental concern.But the digester has a good result.Its gas is kept and used to power electric generators (发电机).
At Blue Farm,the generators make enough electricity to power 400homes.The Audet family sells the extra electricity they can't use themselves.

51.We learn from the text that the Audet family is using cow wastes toA.
A.make electricity                    
B.produce fertilizer            
C.build their farm       
D.feed the cows
52.How are the cow wastes collected into the digester at Blue Farm?B.
A.Marie Audet does the work                            
B.The job is done by machine     
C.The cows lift the cow wastes                                          
D.Bacteria get to work on them
53.According to the passage,which of the following is changed into electricity?D,
A.The power of moving water.
B.The heat of burning coal.
C.The power of sunlight.
D.The heat of the methane gas
54.The new way of using cow wastes at Blue Farm might be best descr ibed asC.
 A.reducing         B.saving        C.recycling       D.changing
55.What is the main purpose for writing the passage?A.
A.To introduce a new way of making electricity                  
B.To explain how a new energy works better
C.To show a new rebuilding plan for a big farm                  
D.To explain the reasons for green house effect.

分析 本篇文章主要介绍了"Blue Farm"农场用牛的粪便来发电,既可以清洁环境,再生资源,又能节约能源.

解答 51-55  ABDCA
51.A.细节理解题.根据第一段When the Audet family turns on the lights at Blue Farm,they are using electricity that comes from cows-cow manure (粪肥),to be specific和第三段的最后一句The Audet family sells the extra electricity they can't use themselves.可判断农场用牛的粪便来发电,故选A.
52.B.细节理解题.根据第四段的第一句话"How's it works:A big machine moves back and forth cleaning the barn floor."可知这是它的工作原理:一个大机器来回清洗牛棚的地板.故选B.
53.D.细节理解题.根据文章第四段后部分的描述Its gas is kept and used to power electric generators (发电机),可知沼气的加热可以用来发电,可判断选D.
54.C.主旨大意题.根据When the Audet family turns on the lights at Blue Farm,they are using electricity that comes from cows-cow manure (粪肥),to be specific,可判断这里应该是循环利用.故选C.
55.A.推理判断题.本篇文章主要介绍了"Blue Farm"农场用牛的粪便来发电,既可以清洁环境,再生资源,又能节约能源.所以答案为选项A.故选A.

点评 本文是一篇科普类文章.做题时要在理解好文意的基础上,与题目有机的结合,从文章中找到相关细节性的句子与选项细细比对,进行选择或推理判断,选出符合文章内容的正确选项.做题注意灵活,有时可采用排除法或直选法确定出最终答案.

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