单项选择题

If you go to a number of different shops, you'll find great variation of price for the same articles.

A．variety
B．difference
C．vanity
D．scarcity
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单项选择题
The duty of a soldier is to defend his country.
A．resist
B．assure
C．guard
D．contribute
单项选择题
When there is a(n) slump in a country it is difficult to do trade, and many people are out of work.
A．descent
B．depression
C．inertia
D．decrease
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