一道真题，帮帮忙

chrislmh

Thegeneral availability of high-quality electronic scanners and color printers forcomputers has made the counterfeiting of checks much easier.  In order to deter such counterfeiting,several banks plan to issue to their corporate customers checks that containdots too small to be accurately duplicated by any electronic scanner currentlyavailable; when such checks are scanned and printed, the dots seem to blendtogether in such a way that the word “VOID” appears on the check.
Aquestionable assumption of the plan is that
A.in the territory served by the banks the proportion of counterfeit checks thatare made using electronic scanners has remained approximately constant over thepast few years
B. most counterfeiters who use electronic scanners counterfeitchecks only for relatively large amounts of money
C.the smallest dots on the proposed checks cannot be distinguished visuallyexcept under strong magnification
D.most corporations served by these banks will not have to pay more for the newchecks than for traditional checks
E. the size of the smallest dots that generally available electronicscanners are able to reproduce accurately will not decrease significantly inthe near future
答案是E,我选择了B
一开始看到了A questionable assumption，我想到是寻找一个存在问题的假设，也就是说其他四个都是可以作为前提的，只有正确答案不能。
我读完第一遍就选出了B，就得不难。
事后，我怎样想也想不明白为什么是E。我是这样想的：如果那些电子扫描器在不久就可以打出更小的点去假冒。那么这样对于银行而言不就是浪费了投入了吗？而E正是说不会变小（will not decrease）这样一来不就保障银行的这一行动吗？

slgbond

我想到是寻找一个存在问题的假设，“也就是说其他四个都是可以作为前提的，只有正确答案不能。"

你的理解尤其引号部分，明显对题目要你干啥，理解错了！！

不是找一个能否支撑原文结论的选择，而是找一个假设本身是否问题的选项

未来电子打印机打出来的点儿的尺寸不会变小，这个确实能支撑原文的结论，没错

但这个假设明显有问题，谁能保证，技术不进步，未来电子扫描仪不能复制出来足够小的点儿？

100年不可能，1000年不行？