单项选择题

Today dozens of scientific group in different countries have been _______ the goal of a practical and economic way to use sunlight to split water molecules.

A．reaching
B．winning
C．chasing
D．pursuing
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单项选择题
What seems confusing and fragmented at first might well become _______ a third time.
A．notable and systematic
B．clear and organic
C．clean and measurable
D．pure and wholesome
单项选择题
We find the book quite _______: it provides us with an abundance of information on western music.
A．distracting
B．enlightening
C．amusing
D．confusing
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