–There is _______ on using mobile phones at the gas station.

--Do you mean talking on the mobile phone ________ at the gas station?

A．a ban; is banned

B．ban; banned

C．a ban; banned

D．ban; is banned

配制0.1%苯扎溴铵(新洁尔灭)4000ml，需用5%苯扎溴铵多少毫升()。

A．50

B．60

C．80

D．90

E．100