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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.
    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 machine
    C．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 better
    C．To show a new rebuilding plan for a big farmD．To explain the reasons for green house effect

    【小题1】A
    【小题1】B
    【小题1】D
    【小题1】C
    【小题1】A解析:
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    For years I wanted a garden. I’d spend hours thinking of different things I could plant that would look nice together.
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    A．ThreeB．FourC．FiveD．Six
    【小题2】 What did the mother mean when she said “Money doesn’t grow on trees”?
    A．She was too busy to plant a money tree at that time.
    B．She had to save money so that she could have a garden.
    C．It wasn’t easy for her to make money to raise all the children.
    D．They didn’t have much money because the mother lost her job.
    【小题3】 The “money tree” appeared in the writer’s yard _________.
    A．before her children were born
    B．one spring morning when the children were little
    C．after the children went to school
    D．on a Mother’s Day after the children left her
    【小题4】 The children planted a money tree in their mother’s yard because _________.
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    B．they wanted to show their love to their mother
    C．it was time for them to give the money back to her
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    American people like to say ‘Thank you ’or say something kind when others help them．People of many countries do so，too．It is a very good habit．
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    Let’s learn to say‘Thank you’and‘Excuse me’．
    【小题1】You should say‘Thank you’when_______．

    A．you say something kind to others
    B．you help others
    C．someone helps you
    D．you need others to help you
    【小题2】From the passage we know‘Thank you’is_______．
    A．used in the world
    B．used more often than ‘Excuse me’
    C．used only by Americans
    D．used only between friends
    【小题3】You should say‘Excuse me’if you want to________．
    A．coughB．make some noise
    C．go firstD．A，B and C
    【小题4】When you are going to ask someone to tell you the way，you should say‘_______’．
    A．Thank youB．That’s very kind of you
    C．Excuse meD．I’m sorry
    【小题5】This passage mainly tells us the way_________．
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