题目

—This kind of cloth _________ well and _________ long, besides, it’s cheap.—OK, I’ll take it.A. washes; lasts              B. is washed; lastsC. washes; is lasted        D. is washing; is lasting 答案：A如图，路灯距地面8米，一身高1.6米的人沿穿过灯下的直路以84米/分的速度行走，求该人1分钟从A到B时，人影的长度变化了多少米？