TOEFL Reading: ETS-TOEFL阅读机经 - 34X8O3TEH37861GBL$

According to paragraph 3 and 4, which of the following is true of the earliest ceramics? A. They were in use before the earliest stone tools. B. They were used in only a few places 10,000 years ago. C. They appeared in many places about 10,000 years ago. D. They were all baked in low-temperature kilns.