标题: 问一题逻辑！求救！ [打印本页]
作者: alannesta 时间: 2011-6-11 10:15 标题: 问一题逻辑！求救！
From 1980 to 1989, total consumption of fish in the country of Jurania increased by 4.5 percent, and total consumption of poultry products there increased by 9.0 percent.During the same period, the population of Jurania increased by 6 percent, in part due to immigration to Jurania from other countries in the region.
If the statements above are true, which of the following must also be true on the basis of them
A.During the 1980’s in Jurania, profits of wholesale distributors of poultry products increased at a greater rate than did profits of wholesale distributors of fish.
B.For people who immigrated to Jurania during the 1980’s, fish was less likely to be a major part of their diet than was poultry.
C.In 1989 Juranians consumed twice as much poultry as fish.
D.For a significant proportion of Jurania’s population, both fish and poultry products were a regular part of their diet during the 1980’s.
E.Per capita consumption of fish in Jurania was lower in 1989 than in 1980.
答案是E，但为什么B不对？是因为不知道基数大小吗？还是因为文中说增长的人数中移民只占部分(in part)，所以B中说移民的人不喜欢鱼是有偏误的？
作者: JoshwuS 时间: 2011-6-11 21:33
增加了4.5 % 那么总数是104.5% 增加了 9.0% 那么 总数是109% 不是俩倍关系
作者: alannesta 时间: 2011-6-12 06:40
呃，我没有问C选项，是B选项！
作者: hanlei84921 时间: 2011-6-12 21:43
B不一定是must be true，假设移民过去的人特别喜欢鱼，并且他们消费的
fish比poultry多，如果这样的话，按照题意，本地人就应该现在消费的
poultry比fish多才可以达到题中的增长情况。
如果本地人没有移民那么的喜欢鱼，并且当年鱼的价格上涨，那么本地人就会
减少鱼增加p的消费，由于移民对鱼的偏好实在太强了，所以价格上涨也不能减
少鱼的消费量，那么B就不对了。
我觉得可以想象很多种B不成立的情况，但是E是must be true的。
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