【高中·完形填空·City Lights】
阅读下面短文，从各题所给的四个选项中选出可以填入空白处的最佳选项。

From the hill above the town you can see the whole city. Cars move like slow rivers of ______; windows switch on one by one as the sky darkens.
Looked at from here, the city seems calm. But each light is a separate life: someone cooking, someone arguing, someone sitting alone with a decision they have not yet made.
This is the strange thing about cities. They put millions of lives side by side and yet remain almost silent. We can live in the same building for years without knowing the name of the person next door.
Perhaps that is why we climb hills — not to see the lights, but to remember that behind every one of them there is a life as full and complicated as our own.

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