____ they ____ a cow yesterday?

A．Did; milkedB．Did; milkC．Do; milkedD．Do; milk

B

解析試題分析：句意：昨天他們給奶牛擠奶了嗎？結(jié)合語境可知本句描述的是過去的動作，故用一般過去時態(tài)，一般過去時態(tài)疑問句中一般用助動詞體現(xiàn)時態(tài)，行為動詞用原形，故選B。
考點：時態(tài)
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時態(tài)。英語疑問句中一般具有時態(tài)上的對應(yīng)關(guān)系，注意結(jié)合這一特點進(jìn)行區(qū)分。

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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 (糞肥), to be specific.
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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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A．make electricity B．produce fertilizerC．build their farm D．feed the cows
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____ they ____ a cow yesterday?

A．Did; milked        B．Did; milk          C．Do; milked         D．Do; milk

 

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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 (糞肥), 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.

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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.

 

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

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2. How are the cow wastes collected into the digester at Blue Farm?

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C. The cows lift the cow wastes                         D. Bacteria get to work on them

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

4.The new way of using cow wastes at Blue Farm might be best described as ______.

  A. reducing                   B. saving                   C. recycling            D. changing

5. What is the main purpose for writing the passage?

  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

 

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