单项选择题

Leaving for work in plenty of time to catch the train will ______ worry about being late.

A．rule off
B．prevent
C．avoid
D．obviate
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单项选择题
Whenever work is,being done, energy ______ from one form into another.
A．converts
B．converted
C．is converted
D．is being converted
单项选择题
All normal human beings are ______ at least to a degree they get a feeling of warmth and kinship from engaging in group activities.
A．segregated
B．congregational
C．gregarious
D．egregious
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