单项选择题

Accuracy is ______ to the programming of computers.

A．primary
B．elementary
C．fundamental
D．characteristic
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单项选择题
Believing herself alone in the house she was ______ when she heard someone moving about in the living room.
A．startled
B．afraid
C．annoyed
D．distressed
单项选择题
The children performed a very ______ dance for their parents.
A．gracious
B．graceful
C．smart
D．precise
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