单项选择题

It is up to the government to tackle the air pollution problem and ______ measures in line with the council's suggestions.

A．set about
B．work out
C．fill up
D．bring over
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单项选择题
A safety analysis ______ the target as a potential danger. Unfortunately, it was never done.
A．would identify
B．will identify
C．would have identified
D．will have identified
单项选择题
Dozens of scientific groups ail over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules.
A．pursuing
B．chasing
C．reaching
D．winning
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