彩色显像管荧屏玻璃上涂有（）三种显像荧光粉。
A、红黄蓝
B、蓝绿红
C、红黄绿
D、红黄紫
参考答案：B
计算：（-1）10×3+8÷（-4）．
—Who did it?
— .you ask?It was Joe,of course.
A．May
B．Must
C．Should
D．Need
