1,In the United States,vacationers account for more than half of all visitors to what are technically called "pure aquariums"but fo fewer than one quater of all visitors to zoos,which usually include a "zoo aquarium"of relatively modest scope.
Which of the following, if true,most helps to account for the difference described above between visitoes to zoos and visitors to pure aquariums?
a)Incities that have both a zoo and a pure aquarium, local residents are twice as likely to visit the aquarium as they are to visit the zoo
b)Virtually all large metropolitan areas have zoos,whereas only a few large metropolitan areas have pure aquariums.
c)Pwople who visit a zoo in a given yeat are two times more likely to visit a pure aquarium that year than are people who do not visit a zoo.
d)The zoo quauariums of zoos that are in the same city as a pure aquarium tend to be smaller than the aquariums of zoos that have no pure aquarium nearby.
答案选b，但是题意是什么意思呢？谢谢各位。。。
2，An advertisement designed to convince readers of the great durability of automobiles manufactured by the Deluxe Motor Car Company cities as evidence the fact that over half of all automobiles built by the company since 1970 are still on the road today, compared to no more than a third for any other manufacturer.
Which of the following, if true,most helps to suport the advertisement's arguement?
答案是:The number of automobiles built by Deluxe each year has not increased sharply since 1970.
看不懂答案为什么会支持～
谢谢各位指导～～
第一题是选B，因为大部分大城市都有zoo,但是只有少数城市有pure aquarium,物以稀为贵．大家去度假或游玩，肯定会选后者
第２题是这样理解的，因为Deluxe公司制造的汽车数量没有很大增加，因而它的老车继续使用的比例也会大些（分母不变）
但是其他公司可能每年制造的汽车数量有很大的增加（分母增加），因而比例会小
谢谢你的回答～～～～
不过还有就是第二题中，分子分母不是给定了吗？
over half of all automobiles built by the company since 1970 are still on the road today, compared to no more than a third for any other manufacturer.
请楼主在标题里面给出题目出处，方便大家回帖，方便后人查询，谢谢啊
另外，多个题目，恳请一题一贴，才能方便讨论！
各个区的发贴规范：
GMAT机经＋MATH讨论
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922
GMAT语法区版规
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830
GMAT逻辑区格式和搜索
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=74827
GMAT阅读区-发贴格式和搜索提示
http://forum.chasedream.com/dispbbs.asp?boardID=25&ID=41017
GMAT AWA区版规
http://forum.chasedream.com/dispbbs.asp?boardID=26&ID=107312
好的～
不过这道题是上辅导班时发的资料里面的题，不知该怎么编题号。
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