When the Audet family turns on the lights at Blue Farm, they are using electricity that co

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 30 gallons of wastes each day. Now imagine the output of over 1,000 cows 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 400 homes. The Audet family sells the extra electricity they can’t use themselves.
【小题1】We learn from the text that the Audet family is using cow wastes to . A．make electricity B．produce fertilizerC．build their farm D．feed the cows【小题2】How are the cow wastes collected into the digester at Blue Farm?A．Marie Audet does the workB．The job is done by machineC．The cows lift the cow wastesD．Bacteria get to work on them【小题3】 According to the passage, which of the following is changed into electricity?A．The power of moving water. B．The heat of burning coal. C．The power of sunlight.D．The heat of the methane gas【小题4】The new way of using cow wastes at Blue Farm might be best described as .A．reducingB．savingC．recyclingD．changing【小题5】 What is the main purpose for writing the passage?A．To introduce a new way of making electricityB．To explain how a new energy works betterC．To show a new rebuilding plan for a big farmD．To explain the reasons for green house effectA

(答案→)A 解析：【主旨大意】“Blue Farm” 农场用牛的粪便来发电。即循环利用资源，又节约能源。【小题1】A。细节理解题。根据第一段和第三段的最后一句The Audet family sells the extra electricity they can’t use themselves.，可判断选A。【小题1】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.”可判断选B。【小题1】D。根据文章第四段后部分的描述，沼气的加热可以用来发电，可判断选D。【小题1】C。主旨大意题。根据前三段和最后一段，可判断选C。【小题1】A。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。

我明天再问问老师，叫他解释下这个问题