单项选择题

To ensure the development and exploitation of a new technology, there must be a constant ______ of several nevertheless distinct activities.

A．interplay
B．implementation
C．improvement
D．exploration
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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
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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