粉尘的危害有哪些()。
A.对人的听力有损害
B.污染天空臭氧层
C.可能导致爆炸
D.污染水源和生物
参考答案:C
Are you good _____ teaching kids? We need a weekend teacher. [ ]
A. with
B. at
C. for
D. in
客人反映水果质量不好怎么办?