在500mL的水中有一个草履虫，现从中随机取出2mL水样放到显微镜下观察，则发现草履虫的概率为[ ]
A.0
B.0.002
C.0.004
D.1
答案：C
按照显示设备所用的显示器件分类，有（）、液晶显示器、等离子显示器。
The nurse is performing a neurologic assessment on a client during a routine physical examination. To assess the Bakinski’s reflex, indicate the point where the nurse would place the tongue blade to begin the stroke of the foot（）
A. A
B. B
C. C
D. D
