题目

 — The factory ______ its waste into the river, but now it ________ the  waste in a new way ?  — Everyone must make a contribution to ________ the environment. A. used to pour ;deals to ; protect          B. is used to pour; deals about; protect             C. used to pour; deals with ; protecting          答案：C腌肉长时间不易腐烂，是由于盐分多会抑制细菌的繁殖和生长．