单项选择题

A．We should blame external factors.
B．We should blame internal factors.
C．We should blame others.
D．We needn’t blame ourselves.
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单项选择题
A．They can be bred in any conditions.B．They produce oxygen.C．They can easily be carried in spaceships.D．They are organisms.
A．They can be bred in any conditions.
B．They produce oxygen.
C．They can easily be carried in spaceships.
D．They are organisms.
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