催化真核mRNA前体转录的酶是
A．RNA聚合酶ⅠB．RNA聚合酶ⅡC．RNA聚合酶ⅢD．RNA复制酶
参考答案：B
一件上衣368元，上衣比一条裙子贵196元。买这两件共需要多少钱？
The students made heated discussions ______ the education system.
A．as to
B．due to
C．owing to
D．with regard
