单项选择题

All the light in the house are ______ in the draught from the opening window.

A．floating
B．fluttering
C．wavering
D．flickering
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单项选择题
The precise instrument can record the slightest ______ in pressure.
A．variety
B．variance
C．varsity
D．variation
单项选择题
Though computer has many advantages, it is by no means without its ______.
A．limitations
B．refrain
C．confinements
D．boundaries
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