请将译文补充完整(每空一词):调查采用分层随机抽样法,从零售业13个类别45,034家注册公司中,选出640家作为调查对象。Out of the 45,034 registered companies in the retail industry, 640 companies were selected by a ___sampling methodacross 13 branches for the survey.
【简答题】听下面一段材料,回答第1-3题。 1. What’s the woman’s job? A. She’s a reporter. B. She’s an educational expert. C. She’s a designer. 2. What is 'Word Up'? A. A TV program. B. A popular for learning English. C. ...