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．Human brains differ from person to person.B．The brain a person is born with is vital in determining his intelligence.C．Environment is crucial in fostering a person’s intelligence.D．Persons having identical brains are doomed to have identical intelligence.
A．Human brains differ from person to person.
B．The brain a person is born with is vital in determining his intelligence.
C．Environment is crucial in fostering a person’s intelligence.
D．Persons having identical brains are doomed to have identical intelligence.
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