按物质的流动过程可将气化炉内的反应分三个区域，即射流区、管流区和（）。
A.撞击区
B.缓冲区
C.回流区
D.折流区
参考答案：C
When the headteacher announced his plan for a spring outing，the ______ of the students in the class ______ for it.
A．majority；were
B．most；did
C．most；were
D．majority；was
如何做到文明乘梯？
