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 .