单项选择题

A．The red one.
B．The black one.
C．The green on
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单项选择题
But we stuck with it in the third paragraph means______.
A．they felt discouraged
B．they carried on with it
C．they failed in their attempt
D．they made some progress
单项选择题
Dr. Marcy thinks that life may exist in the 55 Cancri system because ______.
A．he has found the system similar to the solar system
B．he has discovered an Earth-like planet there
C．he has discovered a rocky planet there
D．he has found signs of life in the system
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