题目

—There are 60 students in my class and 44 of them use micro blog (微博) very often. —That means about ________ of your classmates are micro blog users, right?     A.half               B.one third     C.two thirds       D.three quarters 答案：D如图所示是家庭电子式电能表的表盘，其示数是KWh，表盘上标有“3200imp/kWh”，表示每消耗1kWh的电能，指示灯闪烁3200次，若家庭电路中只有一台电热水器在工作，该电能表的指示灯在4min内闪烁320次，则该热水器的实际功率是W．