1．The passage mainly tells readers that ________.

　　A．clues of water will be found in Phoenix

　　B．Phoenix will be sent to find clues of water on Mars

　　C．August 2007 will see Phoenix lift off

　　D．the Mars Scout program will be carried out

　　2．The underlined word “prematurely” (Paragraph 5) means “________”．

　　A．on time

　　B．behind the time

　　C．out of work

　　D．ahead of time

　　3．According to the passage, we know Phoenix will land on Mars ________.

　　A．in May 2008

　　B．in August 2007

　　C．in August 2008

　　D．in September 2008

　　4．According to the passage, the name “Phoenix” is after the meaning of ________.

　　A．rebirth

　　B．death

　　C．energy

　　D．hope

　　5．After Phoenix lands on Mars, we can infer it will firstly ________.

　　A．find soil samples and send them to the earth

　　B．look for the icy land to dig for the soil samples

　　C．take photos and send them to the earth

　　D．find the remains of the Mars Polar Lander

　　B

　　Edmund Halley was an English scientist who lived over 200 years ago. He studied the observations of comets(彗星)which other scientists had made. The orbit of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists who dealt with such problems.

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