TOEFL Reading: ETS-TOEFL阅读机经 - JXRF354VW6I1D44ZL$

According to paragraph 3, which of the following is true of ancient Mesoamerican writing? A. It is very similar to the modern writing of Mesoamerican peoples. B. It is not as old as originally thought. C. It can be used by modern peoples to express their own identities. D. It is most thoroughly understood by skilled native craft workers.