单项选择题

The environmental balance among ecological communities is exceedingly complex.

A．almost
B．successfully
C．extremely
D．rarely

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(80) Social technology as well as physical technology need to be applied in making human arrangements that will transcend anything mankind has yet experienced. People need not be victimized by their environments; they can be fulfilled by them.

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(79) Mankind takes great pains with physical architecture, and is beginning to concern itself with the design of systems in which the human being is a component. But most of these designs are only for safety, efficiency, or productivity.

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