单项选择题

Many countries have conservation programs to prevent certain ______ of fish from becoming extinct.

A．species
B．sources
C．numbers
D．members
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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
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
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