非净化风进入原料油加热炉管线的作用是（）。
A.烧焦
B.吹扫
C.搅拌
D.冲压
参考答案：B
如果一个角的补角是这个角的4倍，那么这个角为______度．
-Tom is very stupid. He failed to passthe exam once again.
- He is _____ than stupid. [ ]
A. lazier
B. no lazier
C. more lazy
D. lazier rather
