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
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.
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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