4. What is the most abundant (by mass) element found in the human body?
(A) carbon;
(B) hydrogen;
(C) calcium;
(D) oxygen;
(E) water.
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統計: A(4), B(1), C(0), D(0), E(0) #2345307
統計: A(4), B(1), C(0), D(0), E(0) #2345307