单项选择题

Chinese people are now enjoying better dental health, as shown by the declining ______ of tooth decay.

A．treatment
B．incidence
C．consequence
D．misfortune
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单项选择题
The money I got from teaching on the side was a useful ______ to my ordinary income.
A．profit
B．supplement
C．subsidy
D．replacement
单项选择题
The new aircraft will be ______ to a test of temperatures of -65 and 120.
A．suspended
B．suppressed
C．summoned
D．subjected
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