听力ceramic制作历史

31. ceramics date back approximately _____.

32. The first figurines were made in the area of _____.

33. early humans could not use their pots to store ____.

34. The Chinese improved the quality of ceramics by mixing ____ with the clay.

35. Chinese porcelain was also called _____.

36. Bottger added quartz and _____ to clay to make porcelain.

37. Glass production is similar to clay ceramics apart from the rate of _____.

38. the romans introduced the use of glass to make _____.

39. the discovery of concrete is probably due to observing reactions of water and ____.

40. the ability to build large _____ contributed to the success of the Roman Empire.