题目

Mrs Black isn’t in and I’ll have to ring ______. I would appreciate it if you ring _____ after 6 o'clock?   A. off; back     B. up; off     C. out; up    D. back; off 答案：A 解析: Black女士不在家, 我现在不得不把电话挂上了; 要是你在6点钟后再来个电话我将不胜感激。ring off挂断电话；ring back回电话；ring up 打电话；ring out响起；宣布离去。有两根电线,第一根长28米,比第二根的3倍还多2.2米,第二根电线长多少米?