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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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.
单项选择题
What is the author's attitude towards Bush's spaceflight program
A．Negative.
B．Positive.
C．Neutral.
D．Not mentioned in the passage.
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