防毒抢险是消防队伍不可缺少的一想专门勤务，主要是在火场上有毒、浓烟、缺氧等复杂情况下担负侦查、救人、灭火、抢险等攻坚任务。
参考答案：对
At the meeting, the old man ________ some good advice about bringing down the market price of housing.
A．came about
B．came along
C．came up with
D．came out
The notice came around two in the afternoon _____ the meeting would be put off.
A．when
B．whether
C．that
D．how
