大全C9——太难了吧...

大全-C-9.     Determining the authenticity of purported pre-Columbian artifacts is never easy. Carbon-14 dating of these artifacts is often impossible due to contamination by radioactive palladium (which occurs naturally in the soils of Central and South America). However, historians and anthropologists have evolved two reliable criteria, which, utilized in combination, have proven effective for dating these artifacts. First, because authentic pre-Columbian artifacts characteristically occur in a coarse, granular matrix that is shifted by major earthquakes, they often exhibit the unique scratch patterns known as gridding. In addition, true pre-Columbian artifacts show a darkening in surface color that is caused by centuries of exposure to the minute amounts of magnesium in the soil of the Americas.

The criteria above would be LEAST useful in judging the authenticity of which of the following?

(A) An ax head of black obsidian, unearthed from a kitchen midden

(B) A pottery bowl with a red ocher design, found in the ruins of a temple

(C) A set of gold ear weights, ornamented with jasper pendants

(D) A black feather cape from a king’s burial vault（D）

(E) A multicolored woven sash found near the gravesite of a slave

我一直没搞懂五个选项跟这道题有什么关系。。。凭什么选D啊？

谢谢NN！

是因为D是black的么，所以darkening没效果，而且fether也不会因为地震有scratch。我是这么想的。。。不知道对不对。。。我也选错了

帮顶一下

期待NN解释