空气净化机的强力集尘效果可以除去空气中小至多少尺寸的微尘物。（）
A、0.01mm
B、0.1mm
C、0.1um
D、0.01um
参考答案：D
玄奘去西天取经经过了多少个国家？
A.100
B.110
C.128
D.138
—Honest advice, though unpleasant to the ear, benefits conduct.
—I can’t agree more. _______.
A．A good medicine tastes bitter
B．Good health is above wealth
C．Hope for the best and prepare for the worst
D．Actions speak louder than words
