单项选择题

The President ______ his deputy to act for him while he was abroad.

A．promoted
B．substituted
C．authorized
D．displaced
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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
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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