单项选择题

When you get excited, try to hold yourself ______.

A．up
B．down
C．off
D．in
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单项选择题
Many of the students have a grasp of the main structures, a reasonable vocabulary and a (n) ______ idea of how to pronounce most words they come across.
A．faint
B．vague
C．obscure
D．rough
单项选择题
The mountainous areas of the country are ______ populated.
A．infrequently
B．sparsely
C．slightly
D．loosely
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