Harry: Airlines have made it possible for anyone to travel around the world in much less time than was formerly possible.
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Harry states that because of airlines, anyone can travel around the world "in much less time than formerly possible." Judith rejects his claim, saying that "many flights are too expensive for all but the rich."
To understand what's going on with Judith's response to Harry, it's important to see that Harry is talking about the possibilities that are theoretically available: thanks to airplanes, anyone now has the possibility to travel around the world in much less time than before. Harry isn't saying that everyone is able to take advantage of that possibility all the time, just that anyone who does travel with these airlines will be traveling much faster than in the past. Judith, meanwhile, clearly interprets Harry to be saying that everyone can fly, not just that everyone who flies can travel in less time than before.
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Incorrect. Judith's response shows that she thinks Harry is overlooking the fact that most flights are only accessible to the rich. She isn't saying that he incorrectly assumes that most people are rich, just that he is overlooking the price issue altogether.
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Incorrect. Neither Judith nor Harry is talking about the "right" to travel.
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Incorrect. Judith doesn't think Harry is saying airlines are the only way to travel the world: she thinks he is saying that everyone can afford to fly with airlines.
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Incorrect. Judith's response shows that she thinks Harry is saying that most people can afford to fly on airlines. She doesn't think he is saying most forms of travel are not affordable for most people. The only person who talks about something not being affordable is Judith, and neither Harry nor Judith talks about any form of world travel besides airlines.
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Correct. Harry says that airlines have created the possibility for anyone to travel the world in less time than before. Judith interprets him as saying that everyone can afford to travel by air.