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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Just as the soil is a part of the earth, ______ the atmosphere,
A．as it is
B．so is
C．the same as
D．and so is
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Californians and New Englanders speak the same language and ______ by the same federal laws.
A．sustain
B．stand
C．abide
D．conform
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