单项选择题


A．migrate
B．immigrate
C．emigrate
D．transfer
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单项选择题
The space shuttle Discovery completed its mission for about ______ days before it returned to Kennedy Space Center.
A．10
B．11
C．90
D．94
单项选择题
When the spacecraft was going to land, ______
A．it was almost postponed
B．there scattered showers there
C．people could see it high in the sky
D．people could neither see nor hear it
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