单项选择题

The tremor in her voice () her nervousness.

A. affirmed
B. pronounced
C. disguised
D. revealed

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单项选择题
Under no circumstances ()the first to use nuclear weapons.

A. will China be
B. China will be
C. China is
D. shall China be
单项选择题
A laser beam is used to() even the hardest substance.

A. pass through
B. repair
C. light up
D. identify
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