单项选择题


A．space
B．manned
C．true
D．artificial
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单项选择题
A．called asB．that isC．named asD．known as
A．called as
B．that is
C．named as
D．known as
单项选择题
A．whichB．in whichC．thatD．it
A．which
B．in which
C．that
D．it
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