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
Diana made a lot of effort to persuade her parents into ______ to her going to the United States to study business administration in MIT.
A．contending
B．contesting
C．contenting
D．consenting
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
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