A megalopolis is B. a series of almost continuous metropolitan centers with urban functions that exchange flows of people and goods with the surrounding areas and the rest of the world. An example is the Tokkaido Megalopolis in Japan.
Mark Twain wants to add religious overtones (b)
Because St. Bernard is a dog but has a slightly religious name and a Presbyterian is a dog but also a British church.
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6 would be the second one
7 would be the last one
8 would be the third one
9 would say the second one
