单项选择题

The main topic of the passage is ______.

A．industries in the past and at present
B．changes in the development of industries
C．the protection of industrial workers and customers
D．the freedom of industries

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单项选择题

In the U. S. today______.

A．there are altogether three departments which protect customers and workers
B．stores dealing in foods and drugs are under government control
C．a company with poor or dangerous working conditions is likely to be punished
D．the protection of workers' health and safety is well ensured

单项选择题

The purpose of this passage is to ______.

A．inform
B．criticize
C．entertain
D．persuade