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
He interrupted me ______ by asking irrelevant questions.
A．continually
B．continuously
C．consistently
D．consequently
单项选择题
You must try your best to ______ to the new environment.
A．adopt
B．adapt
C．adjust
D．affect
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