单项选择题

The underlined word "steep" (Para. 9 ) can best be replaced by ______.

A．slopy
B．inexpensive
C．wide
D．unduly high
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单项选择题
Which of the following would be the best title for the passage
A．Space--the Mysterious Space.
B．Space Tom Conference.
C．Edwin "Buzz" Aldrin-the Space Hero.
D．Space Tours Not Faraway.
单项选择题
According to the passage, which of the following statements is NOT true
A．Edwin "Buzz" Aldrin walked on the moon 30 years ago.
B．Apollo program was a bold program.
C．Edwin "Buzz" Aldrin walked on the Mars 10 years ago.
D．Edwin "Buzz" Aldrin is an astronaut of America.
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