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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单项选择题
In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden sea.
A．permanently
B．imperceptibly
C．irregularly
D．precariously
单项选择题
When her purse fell overboard, Sally lost her ______, keys, wallet, and cigarettes.
A．vehicle
B．piano
C．compact
D．complexion
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