41. This article is mainly about _________.
(A) the danger of heart transplant surgery
(B) becoming young by getting a new heart
(C) the effect of genetics on the heart
(D) the twin brothers who received heart transplants
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統計: A(2), B(8), C(9), D(39), E(0) #641389
統計: A(2), B(8), C(9), D(39), E(0) #641389