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1. In US, vacationers account for > 1/2 visitors to pure aquariums
2. But vacationers accout for < 1/2 of all visitors to zoo
3. zoo also have a 'aquarium' of modest scope
All three are premises, and no conclusion is given in the passage.
The limiter here is vacationers to US. So (A) is out, as it is referring to local residents, which is not touched on in the passage.
Neither are we told about distribution of zoos and aquariums between differents sized metropolitan areas. So (B) is out.
(C) tells us there are more pure aquariums than zoos, but doesn't go further to indicate that this is equated to more visitors. (C) is out.
(D) will be a good choice since it gives a reason why people are more likely to end up at a aquarium than at a zoo, and this could account for the difference in numbers.
(E) is out of scope.
It's a local visit vs vocasional visit issue. Most cities has their own zoo, so they don't have to go somewehere else to visit a zoo. However more people need to go somewhere else to visit an aquarium since they don't have a local one, and they count as vocasional visits.
1) how can US be taken as only metropolitan cities. does the vacationers come to the cities only. why not towns, villages and coastal areas.
2) nothing is mentioned about the origin of vacationers,then how can one assume that the local population is vacationers in case of pure aquarium, but local residents in case of zoo. (hong hu how can you assume this)
1) You can safely assume that more people visit large cities than small cities and towns. And if it is true for big cities with zoos, it would be more true for small cities with zoos.
2) What I was trying to say is that a lot of people who live in a city that has a zoo but not an aquarium may choose to go to another city to visit an aquarium. Or they may be more likely to choose to visit an aquarium when they are on vacation in a city with an aquarium, than to visit a zoo, because they have already visited their local zoo many times. If that is the case, then their visit to their local zoo would be counted as local visits, and their visit to an aquarium when they are on vacation would be counted as vocational visits.