单项选择题

A．He took a tour of the city.
B．He read about it.
C．He wrote an article about it.
D．He worked there as a guide.
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单项选择题
A．About 30,000.B．Around 300,000.C．Over 300,000.D．More than 330,000.
A．About 30,000.
B．Around 300,000.
C．Over 300,000.
D．More than 330,000.
单项选择题
A．One in a billion digits.B．Zero.C．One mistake per two hundred digits.D．One in a million digits.
A．One in a billion digits.
B．Zero.
C．One mistake per two hundred digits.
D．One in a million digits.
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