题目

 We all feel it is Jack as well as his wife that ________for their son’s  bad performance at school. A. are to blame    B. is to be blamed    C. are to be blamed     D. is to blame 答案：D在如图所示的5×5方格中，每个小方格都是边长为1的正方形，△ABC是格点 三角形（即顶点恰好是正方形的顶点），则与△ABC有一条公共边且全等的所有格点三 角形的个数是（     ）     A.  1         B.  2        C.  3         D.  4