第1题: [单项选择]A) Tom has posted the letter. B) Tom hasn’t posted the letter yet. C) Tom will go home at once. D) Tom doesn’t want to post the letter for her. 参考答案:B 答案解析:[听力原文] W：Tom，you said you were going to send the letter for me，didn’t you M：Yes．I’ll send i
第16题: [单项选择]在一般情况下，以下关于调查研究中抽样误差的说法正确的是 A. 整群抽样≥系统抽样≥单纯随机抽样≥分层抽样 B. 系统抽样≥单纯随机抽样≥整群抽样≥分层抽样 C. 分层抽样≥系统抽样≥单纯随机抽样≥整群抽样 D. 整群抽样≥单纯随机抽样≥系统抽样≥分层抽样 E. 单纯随机抽样≥整群抽样≥分层抽样≥系统抽样 参考答案:D
