单项选择题

Which of the following is not true about the silicon chip

A．It has appeared since 1960.
B．It is an electronic brain and can store a lot of information.
C．It is a chip of silicon crystal and is very small.
D．It becomes cleverer and more expensive every year.
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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
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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