煤矿机电标准化规定机电设备完好率在（）以上。
A.70%
B.80％
C.90％
参考答案：C
— Honey! Can't you remember Aunt Betty? She is my mum's youngest sister!
— Oh,my dear,you must know I don't know________of your relatives.[ ]
A. anyone
B. anybody
C. every one
D. none
鲜牛肝
