拜托NN解答一道OG13 113，老题新问，文中意思把握不准确

Hugateddybear

113.  The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia. Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed. However, recent statistics show a drop in the number of television assemblers in Borodia. Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.
Which of the following is an assumption on which the argument depends?
(A) The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.
(B) Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.
(C) The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.
(D) The number of televisions assembled annually in Vernland has increased significantly during the past three years.
(E) The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years.

这道题目之前曾经有NN解答过，他的解释如下：
Premise: Televisions are made in both V and B, and B imports TV from V.  The number of televisions sold in B keeps constant.  These TV's come from both B and V. the number of TV assemblers in B decreases.
Conclusion: TV imports from V to B has increased.
The assumption is that if TV assemblers in B are fewer, there will be fewer TV made in B.  A further assumption is that the efficiency of TV assemblers in B has not changed (answer C).
我的问题在于不能通过stimulus的信息概括出他所说的premise，在原题中我标记红色以及他解释中标记红色的地方，我没能明白是什么意思。请NN们指教一下这其中的道理。感激不尽 ：）

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厝暮晴 发表于 2013-4-17 19:05
我说下自己的看法哈。不对勿拍。
貌似题中是没有明确说明TV是产自B和V的。
但是如果纠结于这个，假设这个pr ...

嗯嗯，谢谢晴晴 你说的我懂啦 但是呢 还有个小问题： Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed. 这句话其中的因果关系在哪儿呢？为啥B对V的关税下降，就使得B销售量不变呢？

Hugateddybear

厝暮晴 发表于 2013-4-18 09:36
这个since在这里表示的是尽管的让步的意思，也就是说句子意思是“尽管关税下调，但是TV销售总量还是不变 ...

since居然还有表示让步的含义？我还以为是因果关系呢啊！