－When are you going to Shanghai for your holiday?

－I haven’t decided.         this Sunday        next Sunday is Ok.

A．Not only, but also

B．Neither, nor

C．Either, or

D．Both, and

下列有关原核生物DNA聚合酶Ⅲ的叙述错误的是

A．它是催化复制延长的酶
B．具有5′→3′聚合酶活性
C．具有3′→5′外切酶活性
D．具有5′→3′外切酶活性