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
How many planets orbiting other stars have the two scientists discovered so far
A．100.
B．69.
C．66.
D．65.
单项选择题
What can we learn about Dr. Marcy from the passage
A．He is fond of watching Jupiter.
B．He is from a scientist family.
C．He dislikes working with Paul Butler.
D．He is interested in finding life in outer space.
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