题目

—Why hasn't Tony come? —The invitation letter         to Toby by accident A. was emailed      B. has emailed         C. is emailed   D. emailed 答案：A已知直线l过点A(0,4)，且在两坐标轴上的截距之和为1.（Ⅰ）求直线l的方程；（Ⅱ）若直线l1与直线l平行，且l1与l间的距离为2，求直线l1的方程.