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
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单项选择题
Parents need to teach children the ______ value of good behavior.
A．subtle
B．eternal
C．inherent
D．intrinsic
单项选择题
He leaned out of an upstairs window and felt a current of warm air ______ from the street.
A．floating
B．raising
C．heaving
D．ascending
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