“征免”栏应填( )。
A．照章征税
B．全免
C．折半
D．征免
参考答案：B
解析： 来料加工的征免方式应该是全免。
The elderly _________ good care of in public places like supermarkets and airports; they are likely to get lost.
A．can have been taken
B．ought to be taking
C．must be taken
D．should take
污水在后浮选溶气罐的停留时间是（）分钟。
A.4
B.6
C.8
D.10
