He_________ to paint the whole house but finished only the front


  1. A.
    set about
  2. B.
    set off
  3. C.
    set out
  4. D.
    set in
C
解析：
“他動手漆整個墻但是只漆完了前面�！盇. set about+動名詞形式 B. set off 使爆炸  C. set out 開始做某事，后跟不定式  D. set in 以...為背景，答案C。
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科目：高中英語 來源： 題型：閱讀理解

We redheads are well known for our bad tempers. Now it seems there is scientific backing for our particular complaining as well.

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Previous research had shown that redheads were more resistant to the effects of local anaesthesia(局部麻醉) than people with other hair colours.

The scientists say that this red-haired sensitivity to pain stems from the actions of a gene called MC1R. This is responsible for the production of melanin which gives skin and hair its colour. In about five percent of white people the gene is mutated(突變) leading to fair skin and red hair.

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Professor Daniel Sessler from the Cleveland Clinic in the United States is one of the authors of the study. He says the research is a considerable scientific breakthrough.

"Red hair is the first phenotype(表現(xiàn)某一顯性特征之生物個體或群體) of anaesthetic requirement in humans. And what I mean by phenotype is an external(外部的) characteristiC．

"So suppuse you are walking down the street and you see someone who's a little older and a little younger - that tells you nothing about their anaesthetic requirement. You see a man and a woman - that tells you nothing about their anaesthetic requirement. But you see a redhead - aha! You know that person is going to require 20 percent more general anaesthesia."

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Some dentists argue that a greater sensitivity to pain might actually benefit redheads and drive them to see the dentist more quickly. In my own case I can prove that is definitely not true.

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B．usually more sensitive to some painful things

C．just well-known for their good temper and strong pain sensitivity

D．good-looking with fair skin and red hair

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C．some persons with this gene in the brain

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2． A. so                    B. just           C. even          D. ever

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1.

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2. 

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3.

To deal with this, the DNA of people living in these areas has changed slightly; scientists call this a mutation. Originally, the coloring on our body is a mixture of two kinds of melanin – black melanin is suppressed while only red / yellow melanin is made. The result is red hair, light skin color, freckles and a greater sensitivity to sunlight.

4.

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5.

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