______， a sleepy driver killed twenty－two students and teachers in a traffic accident in Shanxi Province.

A．What's more

B．After all

C．Believe it or not

D．More or less

我国使用的２位长途区号共（），为大区中心及直辖市本地网使用。

A.8个

B.9个

C.10个

D.11个