税票调换证销毁时由（）级国税机关负责实施
A.省局
B.市局
C.县（区）局
D.基层国税机关
参考答案：C
More and more vehicles using cheap fuel, declared scientists at the conference, have left Bangkok's children with body lead levels the world highest.
A．in the world highest
B．in the world's highest
C．among the world's highest
D．among the highest of world
下列环节中属于发文阶段的有（）。
A．批办
B．用印
C．登记
D．签发
