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a

n.
1.the blood group whose red cells carry the A antigen
2.a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron)
3.any of several fat-soluble vitamins essential for normal vision
4.one of the four nucleotides used in building DNA
5.(biochemistry) purine base found in DNA and RNA
6.the basic unit of electric current adopted under the Systeme International d'Unites
7.the 1st letter of the Roman alphabet

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    Idiom of the Day

    make a bed
    to arrange the sheets and blankets of a bed neatly
    My mother always told me to make my bed when I was a child.



    1.
    The boss was good enough to ________ my mistake.

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    Fact
    To take an oath, ancient Romans put a hand on their testiclesthat s where the word testimony comes from.      .. More >>
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