求助OG书上的模考题

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whether he languages of ancient American peoples wereused for expressing abstract universal concepts can be clearly
answered in the case of Nahuatl.  
Nahuatl, like Greek and German, is a language that allows
  the formation of extensive compounds. By the
  combination of radicals or semantic elements, single
  compound words can express complex conceptual
relations, often of an abstract universal character.
  The tlamatinime (―those who know‖) were able to
  use this rich stock of abstract terms to express the
  nuances of their thought. They also availed themselves
  of other forms of expression with metaphorical meaning,
some probably original, some derived from Toltec
  coinages. Of these forms the most characteristic in
  Nahuatl is the juxtaposition of two words that, because
  they are synonyms, associated terms, or even contraries,
  complement each other to evoke one single idea. Used as
metaphor, the juxtaposed terms connote specific or essential
  traits of the being they refer to, introducing a mode of poetry
  as an almost habitual form of expression.



1.Which of the following can be inferred from the passage regarding present-day research relating to Nahuatl?
A. some record or evidence of the thought of the tlamatinime is available
B. for at least some Nahuatl expressions, researchers are able to trace their derivation from another ancient American language.
C. researchers believe that in Nahuatl, abstract universal concepts are always expressed metaphorically.








第一题答案是ab，而我选的是a。答案分析说b中的another ancient American language 指的是Toltec coinages。如果是的话我就有点迷惑了。我没有相关的背景知识about Toltec coinages，所以也不清楚Toltec coinages是不是ancient American language，而文中也没有明确告诉读者Toltec coinages到底是什么语种，只是提到一次。这样的话怎么就能确定它一定是呢？