题目

The flowers his friend gave him will die unless______ every day. A. watered    B. watering    C. water   D. to water 答案：A15．点 P（m，n）是反比例函数 y=$\frac{k}{x}$图象上一动点，当n+3=2m时，点P恰好落在抛物线y=x2-2x-3上，则k的值等于20．