单项选择题

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A.By the checkout clerk.
B.By the customers themselves.
C.By a laser beam of light.
D.By the cash register.
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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.
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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