单项选择题

An ______ is a set of beliefs, especially the political beliefs on which, people, parties, or countries base their actions.

A．ecology
B．ideology
C．idiom
D．academy
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单项选择题
An attempt to rescue the American ______ ended in disaster when a helicopter crashed.
A．captives
B．hostages
C．convicts
D．hosts
单项选择题
I had to cancel our lunch date, as it ______ with my hospital appointment.
A．coincided
B．consisted
C．coexisted
D．restrained
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