one question from new oriental test book
16. [U]Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, [/U]is finding uses in medicine, archareology, and criminology.
A. the orginal wording
C. A technique originally developed for detcting air pollutants, called proton-induced x-ray emission, which can quickly analyze the chemical elements in alsmost any substance without destroying it.
The right answer is A, but I do not know what's wrong with the answer C. Please advice. Thx in advance. |
