题目

――Why was Peter so angry? ――        what Mary had said to him．A．Because                  B．As                          C．Since                      D．Because of 答案：D如图，边长为的正方形纸片剪出一个边长为的正方形之后，剩余部分又剪拼成一个矩形(不重叠无缝隙)，若拼成的矩形一边长为3，则另一边长是（      ）A．　　　　 B． C．         D．