单项选择题

What does the underlined word "it" in the second paragraph refer to

A．Discovering the moon's inner space.
B．Using the earth's inner space.
C．Meeting the "moon people".
D．Traveling to outer spac
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单项选择题
A．asB．ifC．becauseD．while
A．as
B．if
C．because
D．while
单项选择题
A．ButB．AndC．BesidesD．Even
A．But
B．And
C．Besides
D．Even
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