题目

下列美丽的图案，既是轴对称图形又是中心对称图形的个数    （      ） 答案：p;【答案】D解析:p;【解析】略16、The town’s drinking-water _____ with prim chemicals at present. A. contaminates     B. is contaminated     C. is being contaminated    D. has been contaminated