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.
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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
单项选择题
A．asB．ifC．becauseD．while
A．as
B．if
C．because
D．while
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