金属性粉尘是（）
A.石棉粉尘
B.水泥粉尘
C.氧化铅粉尘
D.合成树脂粉尘
E.有机燃料粉尘
参考答案：C
In our class, Tom is taller than ________. [ ]
A. other boy
B. another boy's
C. any other boy
D. the other boy
经济规律
