题目

Mr Black decided to give up his farm and devoted all his time to ______ those homeless children.    A. help        B. be helping      C. helping       D. being helped 答案：C如图所示的正方形网格中，网格线的交点称为格点．已知A、B是两格点，如果C也是图中的格点，且使得△ABC为等腰三角形，则点C的个数是（ ）A．6B．7C．8D．9