单项选择题

Scientists are beginning to understand that men are different from animals because ________.

A．they can think and learn
B．they can speak
C．they can use computers
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单项选择题
A small fire _________.
A．is caused by a big fire
B．can become a big fire very fast
C．can never become a big fire
单项选择题
A．butB．andC．because
A．but
B．and
C．because
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