能作为监测空气污染程度的指示植物是[ ]
A．藻类植物
B．祼子植物
C．蕨类植物
D．苔藓植物
答案：D
By nine o'clock yesterday evening, we ______ our work.[ ]
A. have finished
B. finished
C. had finished
D. finish
“少尿”是指24小时尿量少于( )
A．0.2LB．0.3LC．0.4LD．0.5LE．1L
