单项选择题

Not all details of the microchip's performance are ______

A．available
B．adequate
C．sufficient
D．approachable
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单项选择题
To some extent, the principle of secrecy has been ______
A．maintained
B．held
C．observed
D．implemented
单项选择题
Scientists say that many factors ______ great changes in the weather.
A．brought about
B．brought on
C．brought up
D．brought forward
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