单项选择题

The word "renewable" (paragraph 2, line 2)______.

A．able to be produced or used again
B．able to be purchased again
C．able to be borrowed again
D．able to be discovered again
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单项选择题
Wind stations would not be a solution to the state's energy needs if______.
A．they were not built on the windiest hills
B．ways to store the generated power were not found
C．they were used only for commercial purposes
D．ways were not found to increase the wind speed
单项选择题
The main disadvantage of wind power is that it______.
A．is competitive
B．produces more pollutants
C．is low in efficiency
D．is ugly
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