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
Some works of literature hold one's interest to the very last page, but others serve only as a ______, to be kept handily at a bedside table.
A．reference
B．soporific
C．pleasure
D．reminder
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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