单项选择题

Human beings have ______ themselves to very diverse environments with the help of fire, agriculture and machines.

A．adapted
B．addicted
C．adopted
D．adhered
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单项选择题
______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose proficiency of language is poor.
A．To be equal other things
B．Other things to be equal
C．Were other things equal
D．Other things being equal
单项选择题
______ a sudden explosion, there is a real probability that these kids could be injured.
A．Being there
B．Should there be
C．There was
D．There have been
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