识别转录起点的是（）
A.核心酶
B.ρ因子
C.RNA聚合酶的σ因子
D.RNA聚合酶的α亚基
E.RNA聚合酶的β亚基
参考答案：C
Have you seen Tom recently? I wonder ______ with his students.
A．how is he getting along
B．if he is getting along well
C．what he is getting along
D．that he gets along well
下列各句中加粗的词不是偏义复词的一句是[ ]
A．昼夜勤作息
B．否泰如天地
C．我有亲父兄
D．便可白公姥
