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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

    back in circulation
    to be available to the public again (a library book)
    The books were back in circulation after we returned them to the library.



    1.
    The driver tried his best (a) / to avert the accident by (b) / bringing the car (c) / to a suddenly stop .(d) /No error (e)

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