求教：FeiFei-80

80. Advertisement: Clark brand-name parts are made for cars manufactured in this country. They satisfy all of our government automotive tests-the toughest such tests in the world. With foreign-made parts, you never know which might be reliable and which are cheap look-alikes that are poorly constructed and liable to cost you hundreds of dollars in repairs. Therefore, be smart and insist on brand-name parts by Clark for your car.

The argument requires the assumption that

A.      Clark parts are available only in this country

B.      foreign-made arts are not suitable for cars manufactured in this country

C.      no foreign-made parts satisfy our government standards

D.      parts that satisfy or government standards are not as poorly constructed as cheap foreign made parts

E.       if parts are made for cars manufactured in our country, they are not poorly constructed

疑问：《费费宝典》给出的解析是B、E是加强，C与选项无关。我的问题：

1、如何区别“加强”选项和“assunption”选项的区别？

2、C选项不也是加强吗？

加强和assumption的区别在于，assumption取非后对结论是削弱的作用，而加强取非后对结论没任何作用。

我觉得C是太绝对了，you never know which might be reliable and which are cheap look-alikes... 从原文看，还有其他品牌质量好，只是我们无法判断而已。而C则说没有一个质量好，于原文违背。

哪位大侠帮我看一下E选项取非后难道就不能消弱结论么？我还是没有办法苟同上面关于假设和加强的区别的说法。

E取非后，parts made for cars manufactured in our country are poorly constucted,就与国外的parts一样，那么就对结论削弱了，因为E取非后，就不用买clark parts了。

不知道我这么想对不对。谢谢

我比较不喜欢什么取非啊什么的技巧。还是顺其自然的看看题意好了。Assumption的意思是 A + assumption ==> B，但是单独A无法推导出B来。我们可以看到manufactured for cars made in country只是其中一个论据，加上satisfy all our government automotive tests，以及foreign-made parts没有satisfy那些测试，才能得出Clark brand-name parts比foreign-made parts更让人放心的结论。这里的关键是是否satisfy tests而不是质量本身。不能选E的原因是文章中没说所有parts made for cars manufactured in our country都satisfy all our government automotive tests，所以不会是作者的假设。