单选题
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.
【正确答案】
B
【答案解析】
[解析] 在本文的第三段就交代得十分清楚：tunnels，car parks，shopping areas。
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