单项选择题

Although buses in this district are scheduled to depart at a certain hour, they are often late.

A．planned
B．requested
C．obligated
D．loaded
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单项选择题
The Constitution guarantees that private homes will not be searched without a warrant.
A．special guard
B．written authorization
C．national emergency
D．small payment
单项选择题
Honey guides, or indicator birds,collaborate with honey badgers in seeking out bee colonies.
A．work together
B．travel
C．dwell
D．compete
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