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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.2 H# g1 j! K( n4 Q* F3 O# Y8 `+ C
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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.1 U K3 Z/ L1 c! o |' P
3 n2 k8 n1 u+ T 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.! [6 F: R7 |/ O
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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."2 P" O% h; L7 f1 r) s- t! \
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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.: A! P j. C* l2 G2 H, X
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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).
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At Blue Farm, the generators make enough electricity to power 400 homes. The Audet family sells the extra electricity they can't use themselves.
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51. We learn from the text that the Audet family is using cow wastes to ______.- W9 V2 {# b6 c
2 {5 \7 S/ A. C, V$ c8 Z3 j4 j1 i4 q A. make electricity B. produce fertilizer C. build their farm D. feed the cows% L; ^; O, s: V# D) e, V* x$ N
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52. How are the cow wastes collected into the digester at Blue Farm?& B1 x s' i( p5 ?5 V, c8 O# ~
" Q' {# _0 X/ P A. Marie Audet does the work B. The job is done by machine
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C. The cows lift the cow wastes D. Bacteria get to work on them/ D0 f. [! ]3 Q
6 I" ^& N# l# R R' M 53. According to the passage, which of the following is changed into electricity?) p5 Y- E- b! a1 }) O( V+ M0 b6 s
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A. The power of moving water. B. The heat of burning coal.
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9 [- G6 A2 _3 a- r: g" j C. The power of sunlight. D. The heat of the methane gas
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54. The new way of using cow wastes at Blue Farm might be best descr ibed as ______.
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9 {! }3 W6 x R A. reducing B. saving C. recycling D. changing, ]* f1 t. K$ q8 ^4 e+ m7 H! N% b5 Z
4 i- H) ^: s3 ?/ t 55. What is the main purpose for writing the passage?
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A. To introduce a new way of making electricity B. To explain how a new energy works better0 ^; _. Q) J$ w% `, w# A
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C. To show a new rebuilding plan for a big farm D. To explain the reasons for green house effect, X+ o5 d/ E/ T" V% k* b0 }
答案：ABDCA |
发表于 2012-5-10 10:24:37
