单项选择题

A．To help the man pack.
B．To look after her sister’s child.
C．To stay at home.
D．To visit her sister.
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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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