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
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.
单项选择题
Which statement best expresses the theme of the passage
A．Bosses create stress.
B．Workers don' t need bosses.
C．Workers should participate more in decision-making.
D．Workers know better than bosses.
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