题目

Short skirts ______a few years ago, but they have come back again. A. went out           B. came out          C. gave out           D. let out 答案：A 解析: . go out过时、不流行、不时兴。一台“220V  1000W”的电热水器，正常工作10min消耗的电能是    J，如果该能量的70%被水吸收，能使    kg的水温度升高20℃）．