单项选择题

From science courses students should ______ a useful command of science concepts and principles.

A．require
B．acquire
C．demand
D．inquire
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单项选择题
The authorities are discouraging new ______ who want to enter the country as there aren't enough jobs for them.
A．passengers
B．migrants
C．immigrants
D．emigrants
单项选择题
He always talks and behaves in a very ______ way.
A．respective
B．respectable
C．respectful
D．respected
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