单项选择题

To maintain public______is not only the policemen's duty but also every citizen's responsibility.

A．custom
B．confidence
C．security
D．simplicity
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单项选择题
If you take a(n)______course like her you can learn English in less than two years.
A．intensive
B．extensive
C．expansive
D．retentive
单项选择题
Molly has always been a(n)______child; she becomes ill easily.
A．delicate
B．gloomy
C．energetic
D．confident
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