单项选择题

Air, water and food is ______ to good health.

A．vital
B．convenient
C．important
D．sufficient
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单项选择题
An area of rich forests was ______ to life
A．advantageous
B．decorative
C．attracted
D．privileged
单项选择题
I ______ that you and Jim and Bill have all finished this work.
A．doubt
B．show
C．display
D．suspect
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