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
The middle aged woman has been ______ with a serious illness for half a year; she is dying now.
A．laid down
B．laid off
C．laid up
D．laid in
单项选择题
There is a direct flight at 3:00 or a flight at 7:30 in the morning that ______ in Los Angeles.
A．stops by
B．stops in
C．stops over
D．stops up
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