下列主要引起纤维性疾病的毒物是（）
A.一氧化碳、二氧化硫
B.甲基汞
C.农药中毒
D.粉尘
E.石油裂解气
参考答案：D
what does the instruction say?
You should use cold water to wash the dress, or the colors in the dress will___
A．appear
B．run
C．drop
D．fall
He is always full of _____ as if he never knows tiredness. [ ]
A. energy
B. force
C. spirit
D. strength
