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
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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
单项选择题
How many planets orbiting other stars have the two scientists discovered so far
A．100.
B．69.
C．66.
D．65.
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