单项选择题

The authorities of this station see unemployment as their ______ priority.

A．standing alone
B．on the grounds that
C．number one
D．at first sight
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单项选择题
In most urban and suburban area of the world, sick people go to the doctor for ______.
A．care
B．diagnosis
C．healing
D．treatment
单项选择题
Every time a new ______ of some color came into my class at school, my blood would start boiling.
A．emigrant
B．emigration
C．immigrant
D．immigration
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