单项选择题

A．50 minutes.
B．30 minutes.
C．25 minutes.
D．15 minutes.
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单项选择题
It can be inferred that Pac Man and Centipede are ______.
A．traditional video games
B．home video games
C．popular game machines
D．prevalent video games
单项选择题
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 today and in the past.
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 today and in the past.
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