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
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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
单项选择题
Because folk art is neither completely rejected nor accepted as an art form by art historians, their final evaluations of it necessarily remain ______.
A．arbitrary
B．estimable
C．unspoken
D．equivocal
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