单项选择题

______ among black people in South Africa is essential if progress is to be made.

A．Validity
B．Sincerity
C．Solidarity
D．Superiority
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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
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
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