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
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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