请教新东方逻辑补充上Section20-16th

16. Which of the following, if true, is the most logical

   completion of the argument below?

   The tax system of the Republic of Grootland

   encourages borrowing by granting its taxpayers tax

   relief for interest paid on loans. The system also

   discourages saving by taxing any interest earned on

   savings. Nevertheless, it is clear that Grootland’s tax

   system does not consistently favor borrowing over

   saving, for if it did, there would be no——.

   (A) tax relief in Grootland for those portions of a

      taxpayer’s income, if any, that are set aside to

      increase that taxpayer’s total savings

   (B) tax relief in Grootland for the processing fees

      that taxpayers pay to lending institutions when

      obtaining certain kinds of loans

   (C) tax relief in Grootland for interest that taxpayers

      are charged on the unpaid balance in credit

      card accounts

   (D) taxes due in Grootland on the cash value of gifts

      received by taxpayers from banks trying to

      encourage people to open savings accounts

   (E) taxes due in Grootland on the amount that a

      taxpayer has invested in interest-bearing

      savings accounts

答案：A。我理解的原文是这样的：有这样一个tax system，可以鼓励borrowing通过支付利息但是少交利息税，同时不鼓励saving通过征收利息税。但是这样一个体系无法持续有效，因为如果持续有效的话（for if it did），将不会有。。。

A选项没有看明白ft。。。请牛人指点下～

本题的解题思路：

原文——鼓励借款（减税），制裁存款（加税）

问题——如果政策可持续，就不会

答案——或者存款（减税），或者借款（加税）

因此，答案A，意思是政府对于纳税人存入银行的那部分工资实行减税,  符合要求

选项B，属于借款（减税），错。

选项C，借款（减税），错。

选项D,E，存款（加税），错。

明白了，这道题实际上就是考逆否命题，呵呵，谢谢大师的精彩解答！