听力音频：
Questions 31-40
Complete the notes below.
Write ONE WORD ONLY for each answer.
Plastics exhibition
History
first plastic developed to replace ivory in sports equipment
semi – synthetics, e.g. commercial celluloid – used 31. ______ and acid
experiments making plastics from 32. ______ products were unsuccessful
earliest fabric to be produced was artificial 33. ______
Bakelite invented in 1907
first plastic produced in a 34. ______
invented by a 35. ______ called Hendrik Baekeland
unusual because it becomes 36. ______ when heated
Exhibition
Problems with display:
older plastic objects may release acidic 37. ______
plastic objects degrade in 38. ______
Popular exhibits:
chandelier made using recycled 39. ______
car made in Japan from semi – synthetic materials based on substances found in 40. ______
答案
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