单项选择题

The theory says that during the daytime the space animals_______.

A．glow brightly in the sky
B．are invisible
C．can be seen from earth
D．visit the earth' s surface
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单项选择题
A．AfterB．BeforeC．IfD．While
A．After
B．Before
C．If
D．While
单项选择题
A．difficultyB．troubleC．caseD．problem
A．difficulty
B．trouble
C．case
D．problem
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