连续出现或长期出现爆炸性粉尘的环境，按爆炸性粉尘环境危险区域的划分中属于 ( )区。
A．1
B．2
C．10
D．11
参考答案：C
Little did he care about his own safety,_______he was in danger himself.
A．if
B．though
C．since
D．because
“衄家不可发汗”的机理是（）。
A.气能生津
B.气能行津
C.气能摄血
D.血能载气
E.津血同源
