燃料气带液态烃，容易导致转化炉（）
A、自行熄灭
B、炉膛温度降低
C、炉膛温度升高
D、烟囱冒黑烟
参考答案：C, D
73. It is not right _____ a person who is _____ trouble.
A．to make fun of; at
B．to make fun of; in
C．to be made fun of; in
D．to be made fun of; with
