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单项选择题
In the ancient days, human beings needed to use tools because ______.
A．human beings didn’t have sharp teeth like other meat-eating animals and tools helped them to get food more easily
B．tools helped to develop human intelligence
C．tools helped the human beings to cut meat and skin from dead animals
D．it was easy to make stone tools
单项选择题
A．valuesB．worthC．importanceD．expenses
A．values
B．worth
C．importance
D．expenses
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