单项选择题

A．Because it is interesting and creative.
B．Because it has a big effect on our lives.
C．Because she can make big money with it.
D．Because she can graduate more easily.
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单项选择题
Which of the following is consistent with the passage
A．Current rockets are vulnerable and unstable.
B．New propulsion system has been developed.
C．People consider laser beams as a possible solution to developing new propulsion system.
D．At present, nuclear energies can be used in propulsion systems.
单项选择题
The passage is mainly about ______.
A．the development of space' technology
B．the obstacles and prospects of space transportation
C．the public interests in space travel
D．the growth of space business
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