Man: Do you think Mary would translate this paragraph for me Woman: I haven't seen her today. Question: What does the woman imply about Mary

A．Her translations are good.

B．She isn't around today.

C．She can't see very well.

D．It would take her two days to do it.

CJ 3020-1993《生活饮用水水源水质标准》规定二级水源水硝酸盐(以氮计)的含量应不超过( )。

A．20mg/L

B．lOmg/L

C．30mg/L

D．15mg/L