单项选择题

Despite the earnest efforts of __________ private groups as well as government agencies, many of the problems have not yet been solved.

A．varied
B．various
C．variable
D．variant
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单项选择题
It is difficult to __________ the climate of England because the variations are so frequent and unpredictable.
A．indicate
B．illustrate
C．describe
D．remark
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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