58. In gene therapy, ________ can be used as a vector to deliver normal genes directly into the cells of the body.
(A) transposons
(B) mutagens
(C) amniocentesis
(D) bacteria
(E) viruses
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統計: A(5), B(1), C(4), D(16), E(100) #2349853
統計: A(5), B(1), C(4), D(16), E(100) #2349853