单项选择题

Although economists have traditionally considered the district to be solely an agricultural one, the ______ of the inhabitants' occupations makes such a classification obsolete.

A．productivity
B．diversity
C．predictability
D．stability
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单项选择题
Although often extremely critical of the medical profession as a whole, people are rarely willing to treat their personal doctors with equal ______.
A．impulse
B．sarcasm
C．mockery
D．contempt
单项选择题
The trainees were given copies of a finished manual to see whether they could themselves begin to ______ the inflexible, though tacit, rules for composing more of such instructional materials.
A．design
B．revise
C．disrupt
D．derive
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