单项选择题

When the author says that it' s not crazy to think about the impact of this on evolution, he means_____.

A．the progress in biography is so great that people feel astonished
B．the progress in cryogenics is so great that people feel astonished
C．the progress in information technology has great influence on human
D．the progress in information technology is beneficial to human

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单项选择题

In the passage, the author wants to tell us_____.

A．That people dreamed of leaving their home planet and exploring other worlds became reality.
B．After the Apollo program, the emphasis in piloted missions shifted to short-duration spaceflight.
C．Space exploration is a great challenge to human beings and will be achieved through generation's work.
D．Today efforts focus on keeping people healthy during space missions and in increasing the cost of sending satellites into orbit.

单项选择题

What are the challenges of space exploration

A．The challenge was developing rockets powerful enough and reliable enough to boost a satellite into orbit.
B．The challenge was building the satellites themselves.
C．Engineers also had to build tracking stations to maintain radio communications with these artificial "moons" as they circled the planet.
D．The development of rockets and satellites.