单项选择题

A．1.
B．2.
C．3.
D．4.
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单项选择题
A．He bought them from Henry.B．He bought them at a bookstore.C．He found them lying in a quiet street.D．He took them from a car.
A．He bought them from Henry.
B．He bought them at a bookstore.
C．He found them lying in a quiet street.
D．He took them from a car.
填空题
The so called virtual reality mentioned in the second sentence of the passage is actually ______.
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