单项选择题

A．On the 6th of June.
B．On the 8th of June.
C．On the 9th of June.
D．On the 19th of Jun
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单项选择题
A．To spread our knees and legs.B．To put one knee on each side of the box.C．To keep our back straight.D．To put our hands under the object in front of us.
A．To spread our knees and legs.
B．To put one knee on each side of the box.
C．To keep our back straight.
D．To put our hands under the object in front of us.
单项选择题
A．Because the old one could not transfer signals clearly.B．Because the old one could only send two messages along the same line simultaneously.C．Because the old one could not send messages quickly enough.D．Because the old one could not send more than one message at the same tim
A．Because the old one could not transfer signals clearly.
B．Because the old one could only send two messages along the same line simultaneously.
C．Because the old one could not send messages quickly enough.
D．Because the old one could not send more than one message at the same tim
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