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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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 mankind.
单项选择题
If customers are returning shirts because of crooked collars, the people most likely to identify the cause of the problem are______.
A．the salesmen.
B．the supervisors.
C．top management.
D．the people who make the shirts.
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