二、改错 （本大题共10小题，每小题1分，共10分）
下面句子中有 A,B,C,D四个划底线部分，其中有一个是错误的，选出错误部分的字母，无需改正错误。
31. foreign visitors were to the industrial exhibition, they many new products.
32. the adoption of mass-production ，more and more put on the market.
33. the reasons decisions things a better shopper.
34. materials can help you the article，so you them carefully.
35. The six in soon after our country .
36. I was the angry look .
37. We were late. theatre when the performance .
38. It is this wastefulness has got us the mess in now.
39. Because there was demand the product，manufacturers tissues in quantities.
40. The store clerk need to time the price .
