单项选择题

Adler's experience made him realize that______.

A．people are not as capable as they think
B．people can be more capable than they think
C．lack of knowledge leads to failure
D．lack of ability results in lack of determination

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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

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