题目内容

普查的主要缺点有

A. 如果仪器等设备及人力等不足会影响检查速度与精确性
B. 普查的费用往往较大
C. 不适用于患病率低、无简便易行诊断手段的疾病
D. 对于变异过大的资料不适宜做普查
E. 普查由于工作量大而不易细致，诊断可能不够准确

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整样抽样的特点有

A. 易于组织、实施方便，可以节省人力、物力
B. 如群间差异越小，抽取的群越多，则精密度越好
C. 抽样误差较大，故样本量比其他方法要增加1/2
D. 如群间差异越小，抽取的群越少，则精密度越好
E. 抽样误差小于单纯随机抽样

现况研究中，常见的随机抽样方法有

A. 系统抽样
B. 单纯随机抽样
C. 多级抽校
D. 整群抽样
E. 分层抽样

[音频]S= Sellelr C= CustomerS: Good morning. ___________?C: Good morning. Would you show me some typical Chinese souvenirs? I’d like to buy a gift formy wife.S: We’ve got plenty of silk scarves and silk dresses for you to choose from.C: The dress is very nice. _ is it ?S: Fifty-five US dollars.C: It’s a little more than I expected. Could you give me a _____?S: I’d like to, but I’m afraid I can’t. You see, it’s already 5% off the regular price.C: Then I’m _ I can’t afford it.S: Well, let me ask the manager if it’s all right… I’m sorry to have kept you waiting. The best wecan do is to give you a 10% discount.C: OK. I’ll _____.

[音频]R=Receptionist M=Michael HanR: Good morning! Welcome to Holiday Hotel. What can I do for you?M: I have a ____________ with you.R: May I have your name, please?M: Michael Han.R: Let me check. Yes, there it is. A double room for one night. Mr. Han, may I have a _ at yourpassport, please?M: OK, here you are.R: Would you please the registration form?M: All right. What’s the rate for one person per night?R: 59 dollars.M: Do you accept traveler’s checks?R: Sure. Here is the key card to room 3316. The bell-man will show you the way.M: Thanks. I will be leaving tomorrow. When shall I ____out ?R: Any time before 11:00 a.m.M: All right. I’ll remember that.