水罐消防车主要以（）作为灭火剂进行火灾扑救。
A、水
B、泡沫
C、干粉
D、二氧化碳
参考答案：A
— Did you catch what I said?
— Sorry. I ______ a text message just now. [ ]
A. had answering
B. have answered
C. would answer
D. was answering
建设单位领取施工许可证后，因故不能按期开工的，应当向发证机关申请延期，延期次数和每次期限分别为( )。
A．次和3个月
B．2次和6个月
C．2次和3个月
D．1次和6个月
