一般灯具的悬挂高度为（）。
A.2.4～4.0m
B.3.0～6.0m
C.5.0～10m
D.8.0～20m
参考答案：A
世界因生命而变得生动和精彩，地球上最珍贵的财富是[ ]
A．动物
B．植物
C．人类
D．生命
The book which is of being read a second time is 15dollars．
A．worthy; worthy
B．worth; worth
C．worthy; worth
D．worthwhile; worthy
