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【单选题】
下列酶和蛋白因子中，参与DNA复制的是（）。A.
ρ因子
B.
σ(sigma)因子
C.
DNA结合蛋白
D.
释放因子(RF)
E.
逆转录酶
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A.
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B.
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C.
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D.
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A.
ill;ill
B.
sick ;ill
C.
ill; sick
D.
fine; sick
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A.
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B.
detection cost
C.
prevention cost
D.
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E.
A, B, and C only
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A.
his being ill
B.
he is ill
C.
he was ill
D.
his ill
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