英语周报2018-2023高二（GDY）第4期答案

英语周报2018-2023高二（GDY）第4期答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

One possible version:March 7 SundayIneToday witnessed a rewarding activity-Tree Planting organized by the Student Union of our100Early in the morning, my classmates and I headed for a hill nearby with tools andseedlings. On our arrival, we got down to working together as planned. Some dug the pits andput seedlings in, some filled the pits with earth, and others watered them. Through our jointefforts, the hillside was lined with rows of seedlings bathed in the sunshine.Exhausted as we were, we tasted the joy of lalDOI

1)x+y-7=019x+y+7=0(1)设点B的坐标为(a,直线x一y-3=0的斜率为1由于直线AB与直线x-y-3=0垂直,则直线AB的斜率为a-4整理得a+b-7=0又因为点B在直线3x+y-7=0,则3a+b-7=0a+6-7=0所以3+b-7=0解得即点B的坐标为07)因此,AB边所在的直线方程为y=-x+7,即x+y-7=014n13(2)设点C的坐标为(m),由AC的中点在直线3x+y-7=03(m+4)所以2整理得3m+n+1=0又因为点C在直线x-y-3=0m-n-3=023mn+1=0所以解得即点719则直线BC的斜率为2因此,BC边所在直线的方程为y=-19x+7,即19x+y-7=0

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