听力音频：

• Ripping canvas was caused by over stretching of putting into a 31. ______
• Brightness changes due to accumulated 32. ______ on top of painting.
• Paint’s color fades when exposed to the light of the 33. ______
• Method of storage leads to the emerge of 34. ______ in the paint.
• Varied 35. ______ cause sticky paint.

• Restorers applied 36. ______ on the back of canvas to make it stronger.
• Tools such as 37. ______ are used to examine the painting completely.

• Restorers use sponges made from 38. ______ to clean the work softly
• Old paintings were covered with varnish, 39. ______ can’t be used for cleaning
• The most common liquid used in cleaning is human 40. ______

答案