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.
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单项选择题
A．An art museum.B．A beautiful park.C．A college campus.D．An architectural exhibition.
A．An art museum.
B．A beautiful park.
C．A college campus.
D．An architectural exhibition.
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