题目内容
（请给出正确答案）
[主观题]
People have just come to realize that _____.A．human attention is a scarce resourceB．city l
People have just come to realize that _____.
A．human attention is a scarce resource
B．city life can make people very tired
C．the city is an engine of intellectual life
D．an urban environment is damaging to the brain
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