单项选择题

A careful ______ of the house revealed no clues.

A．dissemination
B．pursuit
C．ornamentation
D．examination
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单项选择题
An investigation that is ______ can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.
A．timely
B．unguided
C．consistent
D．subjective
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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