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
Digging the garden with a spade is a very ______ task. I am exhausted after such two-hour's work.
A．industrious
B．manual
C．conscientious
D．laborious
单项选择题
This village which is surrounded by mountains is only ______ by river, and it is obvious that the transportation is inconvenient.
A．accessible
B．attainable
C．available
D．achievable
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