TOEFL Reading: ETS-TOEFL阅读机经 - 70T63B5XBB57M70QL$

According to paragraph 3, which of the following do archaeologists consider to be a strong indicator that an agricultural economy existed in a particular site A. An unusually high number of animal remains near the surface of the site B. Remains of domesticated plants in the teeth of animals C. High numbers of mineral particles inside carbonized plants D. Evidence of little vegetation change for long periods of time