单项选择题

We cannot hope to solve the problems of industrial life, many of which arise directly from the frustrations created by inequality at work, ______ we tackle it head on.

A．provided
B．as
C．unless
D．when
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单项选择题
Martin from time to time offered remarks ______ the effect that he was a wonderful scientist and that he had a good command of psychology.
A．to
B．in
C．with
D．for
单项选择题
Of the thousands of known volcanoes in the world, the ______ majority are inactive.
A．tremendous
B．demanding
C．intensive
D．overwhelming
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