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
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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
单项选择题
Fires kill _________ every year.
A． a lot of people
B． few people
C． only some babies
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