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. Thats 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 cant use themselves.

　　51. We learn from the text that the Audet family is using cow wastes to ______.

　　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?

　　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?

　　A. The power of moving water. B. The heat of burning coal.

　　C. The power of sunlight. D. The heat of the methane gas

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