单项选择题

What does the underlined word "it" in the second paragraph refer to

A．Discovering the moon's inner space.
B．Using the earth's inner space.
C．Meeting the "moon people".
D．Traveling to outer spac
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单项选择题
What sort of underground systems are already here with us
A．Offices, shopping areas, power stations.
B．Tunnels, car parks, shopping areas.
C．Gardens, car parks, power stations.
D．Tunnels, gardens, offices.
单项选择题
What would be the best title for the text
A．Alice Cities — Cities of the Future
B．Space Travel withH.G. Wells
C．Enjoy Living Underground
D．Building Down, Not Up
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