单项选择题

The reduction of noise has been approached in terms of ______ its sources, but the alternative of canceling noise out by adding sound with the opposite wave pattern may be more useful in practice.

A. diffusing
B. tracking
C. concealing
D. isolating
E. eliminating
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多项选择题
No one is ______ about Stephens; he inspires either uncritical adulation or profound ______ in those who work for him.
A. neutral.
B. infuriated.
C. worried.
D. consternation.
E. anxiety.
F. antipathy.
多项选择题
The old man could not have been accused of ______ his affection; his conduct toward the child betrayed his ______ her.
A. promising
B. stinting
C. lavishing
D. adoration of
E. sympathy for
F. tolerance of
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