单项选择题

To ensure the development and exploitation of a new technology, there must be a constant ______ of several nevertheless distinct activities.

A．interplay
B．implementation
C．improvement
D．exploration
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单项选择题
A careful ______ of the house revealed no clues.
A．dissemination
B．pursuit
C．ornamentation
D．examination
单项选择题
For some time now, ______ has been presumed not to exist: the cynical conviction that everybody has an angle is considered wisdom.
A．rationality
B．flexibility
C．disinterestedness
D．insincerity
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