单项选择题

Millions of people in the United States suffer from （）back pain that comes from sitting too long at a desk.

A. chronic
B. casual
C. catastrophic
D. elastic

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单项选择题
You are not allowed to take a second job（）your employer gives you permission

A．so long as
B．otherwise
C．unless
D．whereas
单项选择题
The International Olympic Committee rejects the accusations that Beijing's budget-cutting move might（）its preparation for the games

A．degrade
B．deliberate
C．deploy
D．defend
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