单项选择题

A．freshman
B．sophomore
C．junior
D．senior
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单项选择题
A．Now he understands the system.B．He has no use for technology.C．He has to do some calculations.D．He doesn’t know how to operate the computer.
A．Now he understands the system.
B．He has no use for technology.
C．He has to do some calculations.
D．He doesn’t know how to operate the computer.
单项选择题
A．500 millionB．600 millionC．700 millionD．800 million
A．500 million
B．600 million
C．700 million
D．800 million
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