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
At the end of the passage the author seems to suggest that life in future is ______
A．disastrous.
B．unpredictable.
C．exciting.
D．colorful.
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