单项选择题

Susan never took any cookery courses; she learned cooking by ______ useful tips form TV cookery programs.

A．picking up
B．bringing up
C．putting up
D．pulling up
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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
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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