单项选择题

The supply of groundwater is getting low because of ______.

A．conservation
B．toxic waste
C．pollution
D．population increase
<上一题 目录 下一题>
热门 试题

单项选择题
The amount of groundwater is ______.
A．about 95% of all groundwater
B．less than 5% of all water
C．0.05% of above groundwater
D．95% of above groundwater
单项选择题
The best title for this passage is ______.
A．Water Conservation
B．The Hydrologic Cycle
C．Underground Water
D．Polluted Groundwater
相关试题