单项选择题

A．1727.
B．1826.
C．1839.
D．1860.
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单项选择题
A．Less than one year.B．More than one year.C．Less than one term.D．More than one term.
A．Less than one year.
B．More than one year.
C．Less than one term.
D．More than one term.
单项选择题
A．About 80 miles per second.B．About 70 miles per second.C．About 18 miles per second.D．About 17 miler per second.
A．About 80 miles per second.
B．About 70 miles per second.
C．About 18 miles per second.
D．About 17 miler per second.
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