单项选择题

In the new spaceflight plan, when will the human dream of walking on Mars come true

A．By 2010.
B．After 2020.
C．In 2015.
D．In late 21st century.
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单项选择题
According to this passage, Crew Exploration Vehicle refers to
A．a space shuttle fleet
B．U.S.'s geopolitical strategy
C．a new spacecraft
D．a lunar station
单项选择题
What should be the focus of NASA according to this passage
A．Research.
B．Industrial development.
C．Exploration.
D．National defense.
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