单项选择题

A．About 30,000.
B．Around 300,000.
C．Over 300,000.
D．More than 330,000.
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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.
单项选择题
A．Because her parents like traveling.B．Because her parents like history.C．Because traveling in such places costs less.D．Because her parents want to reinforce the stuff they learned in school about history.
A．Because her parents like traveling.
B．Because her parents like history.
C．Because traveling in such places costs less.
D．Because her parents want to reinforce the stuff they learned in school about history.
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