单项选择题

Solar energy causes

A．less pollution than oil
B．the same pollution as oil
C．more pollution than oil
D．financial problem
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单项选择题
The biggest reason for not using more solar power now is ______. A ) money C) space B) time D) pollution
The biggest reason for not using more solar power now is ______. A ) money C) space B) time D) pollution
单项选择题
In the next few years, the price of gas will ______.
A．come down
B．stay the same
C．go up
D．ebb and flow
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