单项选择题

The vitamins necessary for a healthy body are normally supplied by a ______ of fruit and green vegetables.

A．variety
B．fraction
C．section
D．series
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单项选择题
The manager ______ all the engagements on the ground that he needed more rest.
A．canceled
B．announced
C．eliminated
D．kept
单项选择题
The scientist was so absorbed in his work that he was not ______ of the fire that was spreading to his room.
A．adequate
B．alive
C．aware
D．awake
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