单项选择题

The main advantage of wind powered stations is that______.

A．it does not have polluting effects
B．it is available at any time
C．it can satisfy the state's energy needs
D．it can beautify the environment
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单项选择题
According to the passage, which statement is NOT true
A．A child may accept another person's underestimate of his ability.
B．A child may think that he is too stupid to make the most of his mental faculties.
C．A person may have the idea that he is incapable of doing good work.
D．Some old people believe that they are capable of learning anything new.
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
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