单项选择题

Where there are areas of high unemployment, workers tend to ______ to other, wealthier parts of the country.

A．transfer
B．commute
C．emigrate
D．migrate
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单项选择题
The ______ of a diploma to students with disabilities has a negative effect on their future educational and occupational attainment.
A．refusal
B．betrayal
C．denial
D．serial
单项选择题
The sky was so clear in fact that the communications crew and recovery team could watch the balloon ______ to its maximum altitude with the naked eye.
A．hike
B．elevate
C．escalate
D．ascend
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