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hydrogen

n.
1.a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas

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    Idiom of the Day

    have no business (doing something)
    to be wrong to do something
    The manager has no business asking us about our private business.



    1.
    A physiologist in the last century demonstrated (a) / that puppies will die (b) / if kept awake for more than five days. (c) / No error (d)

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