单项选择题

Dozens of scientific groups all over the world have been __________ the goal of a practical and economic way to use sunlight and split water molecules.

A．pursuing
B．attaining
C．reaching
D．chasing
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单项选择题
The foreign expert who had been praised very highly __________ to be a great disappointment.
A．turned up
B．turned out
C．turned in
D．turned down
单项选择题
It is reported that an increasing number of people __________ building more nuclear power plants.
A．agree
B．approve
C．consent
D．favour
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