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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

    How's that?
    what did you say?
    "How`s that? I couldn`t hear you because the radio was too loud."



    1.
    In celebration at passing his examinations he invited everyone round to crack a ________ and have a drink with him.

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