[求助]一道经典题 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

这道题以前讨论过，但没有说清为什么D对E不对，希望高手在给解答一下。

多谢

咦,怎么没有人耶.我顶,我顶,我顶顶顶.

The author thinks  Clark brand-name parts satisfy  government  tests. So it is reliable. E is just out of this reasoning line. If E is inserted in to reasoning line of the passage, it does not affect the reasoning. However, If D is inserted into the reasoning line, it works and the conclusion can be drawn out. Employing Denial-Test, that is, parts satisfy government tests are poor constructed. If it is true, then the conclusion that Clark brand-name parts is totally denied.

谢谢楼上的。

我明白为什么E不行了，它扩大了原题涵盖范围，原题只提到了clark brand 一种牌子，没说其他的parts are made for cars manufactured in our country，而他们不一定是合格的。

不知我的理解对不对。