阿摩線上測驗
17.Down syndrome is a human genetic disorder caused by the presence of an extra copy of which chromosome?
(A) Chromosome 13;
(B) Chromosome 18;
(C) Chromosome 21;
(D) Chromosome 23.
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統計： A(1), B(0), C(5), D(2), E(0) #3577746
統計： A(1), B(0), C(5), D(2), E(0) #3577746
