题目

 The volunteers for the Shanghai World Expo are busy from dawn ______ dust but they feel very proud of it.        A. at                                          B. on                           C. till                           D. in 答案：C读拼音句子，为下面的图添上缺少的内容。1．wén jù hé lǐ yǒu qiān bǐ．2.  míng ming zài kàn xīng xing．