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One surprising claim about the ancient terra-cotta warrior statues unearthed from pits in northwest China is that a supposedly twentieth century innovation, chemical chrome-plating, was used by the makers of the bronze swords carried by the figures. These swords' blades are free of rust, a state attributed to a coating of about 10 to 15 microns of chromium salt oxide. Yet there is some dispute about whether this was a deliberate process. Modern metallurgists carried out experiments in which they were able to replicate the coatings by using relatively simple methods to process chrome ore with mature vinegar and saltpeter. More skeptical experts theorize that chromic molecules in the soil of the pits permeated the blades' surfaces, thereby forming the chromic salt oxidation coatings.

.It can be inferred from the passage that the experiments performed by the "modern metallurgists" support which of the following theories?

A.The swords' chromium salt oxide coatings prevented the formation of rust.
B.Concentrations of chromic molecules in the soil from which the statues were unearthed have changed since ancient times.
C.The thin coating of chromium salt oxide found on the swords was applied before the swords were placed into the pits.
D.The swords were originally used for other purposes before they were buried with the terra-cotta warrior statues.
E.The thickness of the chromium salt oxide coatings on the swords has likely remained unchanged since ancient times.

C显示答案

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