做好库区的环境卫生，要求仓房外要做到清洁，整齐、（）。
A.一不留
B.二不留
C.三不留
D.四不留
参考答案：C
用所给词的适当形式填空
1. Would you tell me how your father_______ (act) when he is angry?
2. You'd better not be angry at his_______ (angry).
3. Could you tell me the facial_______ (express) of your father when he is happy?
4. I'd like_______ (ask) you a question.
5. _______ ( know) your own dog is not enough.
铲后壁材质是（）。
A．Mn13
B．35CrMo
C．ZG35
