33. RNAi can be used by
(A) researchers to induce the production of more mRNA.
(B) researchers to artificially turn on gene expression.
(C) viruses to stop the production of new proteins.
(D) viruses to increase gene diversity.
(E) cells to prevent infections from double-stranded RNA viruses.

1. 題目解析本題考查的是RNA干擾（...