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
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单项选择题
According to the passage, man has built the modern world because ________.
A． he is very clever
B． he has language
C． he has computers
单项选择题
Scientists once thought that men are different from animals because ________.
A． they can think and learn
B． they can make tools
C． they can speak
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