利用细菌来净化污水的主要原理是( )
A.污水是细菌生存的最佳环境
B.细菌以污水中的无机物为食
C.细菌以污水中的有机物为食
D.污水是细菌繁殖的最佳环境
答案:C
通过Windows操作系统的网上邻居,用户可以共享他人的文件和()。
― I don't think the man enjoys his life, ______?
― No, he can't. That poor man. [ ]
A. does he
B. do I
C. doesn't he
D. do you