单项选择题

A．Why her parents wanted to go to Gettysburg.
B．Why her family’’s vacation plan changed ten years ago.
C．Where her family went for a vacation ten years ago.
D．When her family went on their last vacation.
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单项选择题
A．About 50 kilometers.B．Several hundred kilometers.C．A certain height.D．From the starting point back to the earth.
A．About 50 kilometers.
B．Several hundred kilometers.
C．A certain height.
D．From the starting point back to the earth.
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