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superoxide dismutase

n.
1.an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen

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    Idiom of the Day

    whistle in the dark
    to try to stay brave and forget one`s fear
    The man felt very frightened and began to whistle in the dark. This helped to calm him down.



    1.
    Choose an idiom to replace the expression in the brackets:
    It is (his decision) whether or not he goes to Europe.

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