单项选择题

Senior citizens are advised to go in for some creative activities to keep themselves mentally young.

A．search for
B．invest in
C．engage in
D．work out
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单项选择题
The accepted criteria of adequate diet have been challenged by new discoveries in nutrition.
A．formations
B．components
C．standards
D．ingredients
单项选择题
The very sight of the imposing buildings assured these tourists of the significant changes in this city.
A．instinctive
B．impressive
C．institutional
D．imaginary
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