空气压缩机符号中箭头所指的主向是（）。
A、进气方向；
B、排气方向；
C、进、排气方向
参考答案：B
在一个棱长为5cm的正方体的表面涂上颜色，若将它的棱都5等分；然后分别从等分点把正方体锯开，在锯开的125个棱长为1cm小正方体中表面仅有2个面涂有颜色的小正方体的个数是（ ）
A．24个
B．36个
C．48个
D．60个
As their memories decline, some old people tend to be talkative because they ______ forget what
has just been said. [ ]
A. anxiously
B. particularly
C. easily
D. hardly
