我的问题是：D与E有什么区别？是因为题干中的“at differential rates”这个短语使得E不对吗（E中说是change uniformly)？
原题：
Property taxes are typically set at a flat rate per $ 1,000 of officially assessed value. Reassessments should be frequent in order to remove distortions that arise when property values change at differential rates. In practice, however, reassessments typically occur when they benefit the government – that is, when their effect is to increase total tax revenue.
If the statements above are true, which of the following describes a situation in which a reassessment should occur but is unlikely to do so?
(A) Property values have risen sharply and uniformly.
(B) Property values have all risen – some very sharply, some less so.
(C) Property values have for the most part risen sharply yet some have dropped slightly.
(D) Property values have for the most part dropped significantly; yet some have risen slightly.
(E) Property values have dropped significantly and uniformly.
我的问题是：D与E有什么区别？是因为题干中的“at differential rates”这个短语使得E不对吗（E中说是change uniformly)？
(D) Property values have for the most part dropped significantly; yet some have risen slightly.
E中的uniformly不符合differential的条件，所以不对。
D则一定符合条件，一个向上变一个向下变，那么肯定是at differential rates
我的思路可能有的复杂，第一次做用了快4分钟才想出来答案来。
if property values drop，政府受的税就少了，没什么赚头了。如果老是降的话，政府也不可能傻傻地跑来评估，而赚不到什么钱，于是就符合了问题中说的should be occur but unlike to do so...
這題就是要弄清楚問題，答案就呼之欲出：
1. should occur，即property values change at different rates
2. unlikely to occur，即when reassessment does not benefit government
答案就出來了，D。
這題就是要弄清楚問題，答案就呼之欲出：
1. should occur，即property values change at different rates
2. unlikely to occur，即when reassessment does not benefit government
答案就出來了，D。
這題就是要弄清楚問題，答案就呼之欲出：
1. should occur，即property values change at different rates
2. unlikely to occur，即when reassessment does not benefit government
答案就出來了，D。
没错，照此可以预测答案是什么了
这道题是一条principle题吗？
感觉属于assumption型,在找题目＆问题间的gap
终于懂了。把我的思路写出来：
题目要判断哪种情况：should occur but is unlikely to do so
1）should or shouldn't:
从以下这句判断：Reassessments再课税 should be frequent in order to remove distortions that arise when property values change at differential方向不同的 rates.
should------differential rate
2）likely or unlikely：
从以下这句判断：In practice, however, reassessments typically occur when they benefit the government – that is, when their effect is to increase total tax revenue.
unlikely------decrease
麻烦哪位翻译一下题干，我没明白，不好意思：）
虽然按上面讨论也能做对，可是我就是想知道为什么只有 property values change at different rates美国政府才出手？对于Property values have risen significantly and uniformly时，如果他出手改变了tax（提高tax）不是也有的赚吗？：）
可能有灌水的嫌疑，但是却是想知道，可能这是关于经济的常识问题！
另外还想问：
Property taxes are typically set at a flat rate per $ 1,000 of officially assessed value.
这句话的意思是什么？
盼解答，谢谢！：）
顶.我也有同样的疑问.
是否因为droped uniformly, 所以政府只需要调整revenu rate,未必需要做reassessment.
文章说了要change at differential rates 才会reassess
所以uniformly的时候就不会发生reassessment的情况拉
文章说了要change at differential rates 才会reassess
所以uniformly的时候就不会发生reassessment的情况拉
catcenter，我不是很明白change at differential rates的意思。
这是一个专业术语吗？differential rates就是指有的上升有的下降吗？
谢谢，
Demon Hunter
這題就是要弄清楚問題，答案就呼之欲出：
1. should occur，即property values change at different rates
2. unlikely to occur，即when reassessment does not benefit government
答案就出來了，D。
紧扣这两点，解题就清晰了！
1. 排除AE
2. 排除ABC
1. 同问change at differential rates的意思
2. 怎么叫政府受益？value高的时候，政府的税收不是高么？也就是说政府受益。那这个时候还有必要reassess么？既然她已经受益了
我理解成value低的时候，政府为了得到更多的利益，会reassess，以便使value上升，从而获得更多的利益。 看来是完全反了
请指点一下
1. 同问change at differential rates的意思
2. 怎么叫政府受益？value高的时候，政府的税收不是高么？也就是说政府受益。那这个时候还有必要reassess么？既然她已经受益了
我理解成value低的时候，政府为了得到更多的利益，会reassess，以便使value上升，从而获得更多的利益。 看来是完全反了
请指点一下
differential:Involving differences in speed or direction of motion.
差动的：涉及速度或运动方向不同
change at differential rates: 1. at different speed: see B 2. at different direction: see C and D --- should reassess
change uniformly: 1. rise: see A 2. drop: see E----- no need for reassessment
should and likely(increase tax avenue): B and C
should and unlikely(don't increase tax avenue): D
2. If all property values change uniformely, i.e. at the same rate, why bother to reassess since no distortions occur, government may allow the same rate for decreased or increased value
right?
differential:Involving differences in speed or direction of motion.
差动的：涉及速度或运动方向不同
change at differential rates: 1. at different speed: see B 2. at different direction: see C and D --- should reassess
change uniformly: 1. rise: see A 2. drop: see E----- no need for reassessment
should and likely(increase tax avenue): B and C
should and unlikely(don't increase tax avenue): D
2. If all property values change uniformely, i.e. at the same rate, why bother to reassess since no distortions occur, government may allow the same rate for decreased or increased value
right?
恩 对于uniformly我清楚了。 想问的是： Property values上升，政府才会reassess吗？ 为什么这时候政府受益？
谢谢你的解答啦！
Property taxes are typically set at a flat rate per $ 1,000 of officially assessed value. Reassessments should be frequent in order to remove distortions that arise when property values change at differential rates. In practice, however, reassessments typically occur when they benefit the government – that is, when their effect is to increase total tax revenue.
I think: Because taxes are set at a flat rate(fix rate) per $1000, say M per $1000
For assessed property value raised from $100,000 to $150,000, tax will raise from 100,000/1000 x M to 150,000/1000 x M accordingly. It's obvious that more value, hence more tax and more benefit.
Discuss...
清晰了 还是我对reassess的概念不清晰造成的
谢谢
政府收property的税是根据政府的assess 的value来的，而不是根据市场价格
如果市场价格上升，而政府不reassess的话，而按照原来的value征税，就少收税了。
所以才说当市场value上升的时候，政府才会去reassess，从而benefit tex reveneu
是这样吧
up
政府收property的税是根据政府的assess 的value来的，而不是根据市场价格
如果市场价格上升，而政府不reassess的话，而按照原来的value征税，就少收税了。
所以才说当市场value上升的时候，政府才会去reassess，从而benefit tex reveneu
是这样吧
解释通了一方面，但为什么所有物品价值同时抬升的时候政府不reassess呢（(A) 
roperty values have risen sharply and uniformly）
政府收property的税是根据政府的assess 的value来的，而不是根据市场价格
如果市场价格上升，而政府不reassess的话，而按照原来的value征税，就少收税了。
所以才说当市场value上升的时候，政府才会去reassess，从而benefit tex reveneu
是这样吧
也想问这个，如果只在value上升是做reassess，那么下降时就不做，但为什么所有的value都降得一样时不对呢？反正这样也不会使政府的tax revenue减少。
我已经明白前面用英文的解释，我就是想不明白政府到底是怎么想的……
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