单项选择题

It can be inferred that the toy industry ______.

A．must have gained abundant profit
B．plays a vital role in promoting the early-year education
C．has sponsored the neuroscience research
D．has stimulated children's desire for toys

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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

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.