TOEFL Listening: ETS-TOEFL听力机经 - DRF858_END13XY31P$

What is the professor's opinion about classification systems? A. Many of the current classification systems are confusing. B. Using only one system could result in an incomplete or inaccurate analysis. C. New classification systems are needed to replace the current ones. D. Archaeologists will likely never agree on the best system to use.