单项选择题

A．The high speed and efficiency of the Internet.
B．The health problems due to addiction to the Internet.
C．The joy and comfort provided by the Internet.
D．The irresistible attraction of the Internet.
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单项选择题
A．By the checkout clerk.B．By the customers themselves.C．By a laser beam of light.D．By the cash register.
A．By the checkout clerk.
B．By the customers themselves.
C．By a laser beam of light.
D．By the cash register.
单项选择题
A．Housing costs.B．Average wage.C．Unemployment.D．Oil prices.
A．Housing costs.
B．Average wage.
C．Unemployment.
D．Oil prices.
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