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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单项选择题
Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schools ______ a quarter system comprised of fall, winter, and summer quarters.
A．manipulate
B．stipulate
C．regulate
D．observe
单项选择题
Telecommuting——substituting the computer for the trip to the job-has been ______ a solution to all kinds of problems related to office work.
A．hailed as
B．drawn out
C．born out
D．lodged in
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