单项选择题

A) do C) is
B) does D) are

A．do
B．does
C．is
D．are
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单项选择题
A) change C) communicate B) achieve D) remain
A．change
B．achieve
C．communicate
D．remain
单项选择题
The author's attitude toward space colonization is ______.
A．positive
B．negative
C．ironic
D．detached
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