单项选择题

The postal service has made a smooth ______ to a digital system for monitoring and tracking all mail.

A．location
B．transition
C．suspension
D．cooperation
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单项选择题
Our attempt to eliminate insects and other pests from the property did not go as ______ .
A．plan
B．plans
C．planned
D．planning
单项选择题
Children of preschool age can get up to five free medical ______ each year at their local clinic.
A．instruments
B．consultations
C．occurrences
D．rights
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