单项选择题

Relations between the two countries have ______ since the agreement was signed.

A．deteriorated
B．degraded
C．degenerated
D．decayed
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单项选择题
The country's economic future is seriously ______ by the mass emigration of young people.
A．precluded
B．jeopardized
C．paralyzed
D．hampered
单项选择题
Parents need to teach children the ______ value of good behavior.
A．subtle
B．eternal
C．inherent
D．intrinsic
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