单项选择题

Which of the following is time of the recent discovery

A．The planet is not as protective as Jupiter.
B．The planet is close to star 55 Cancri.
C．The planet proves to be a gas planet.
D．The planet is as large as Jupiter.

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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

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