单项选择题

The stone chip is thought to be the most important tool because it______.

A．was one of the first tools.
B．developed human capabilities.
C．led to the invention of machines.
D．was crucial to the development of mankin
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单项选择题
At the end of the passage the author seems to suggest that life in future is ______
A．disastrous.
B．unpredictable.
C．exciting.
D．colorful.
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.
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