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问题 单项选择题

在统计指标计算过程中，某一指标在不同时间上的数值对比而得到的相对数称作（）。

A.比例相对指标

B.结构相对指标

C.强度相对指标

D.动态相对指标

答案

参考答案：D

单项选择题

男35岁，腹泻伴左下腹轻至中等疼痛2年，每天大便4～5次，间断便血，有疼痛-便意-便后缓解的规律，常有里急后重，最近结肠镜检查发现结肠黏膜粗糙呈细颗粒状，血管纹理模糊。

下列哪项最不可能导致该病

A．遗传

B．过敏反应

C．结肠的感染

D．变态反应

E．细胞免疫异常
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书面表达。
     五一假期即将来临，小兴给远方的弟弟小旺发了个电子邮件。假如你是小旺，请根据
邮件内容予以回复。回信的开头和结尾已经给出(不计入总词数)。
     要求： 1. 词数60-80。
                 2. 条理清晰，语句连贯，字迹工整。
                 3. 以下内容仅供参考，也可自行安排计划。地点：南京、北京、海南…… 活动：游览、拍照、划船…… 名胜：玄武湖、 * * 、长城、天涯海角…… 食物：北京烤鸭、
水果…… 交通工具：汽车、火车、飞机……
From: Xiaoxing@yahoo. com
To: Xiaowang@sina. com
Dear Xiaowang,
     How are you these days?
     The holiday is coming. It's really a nice holiday, isn't it? I still remember that you once invited me to travel with you. Maybe we'll have enough time soon. I'd like to visit some places of
great interest and eat delicious food. It must be exciting to travel with you.
     Ha! Ha!
     You are a good traveler and could you tell me when and where to go, how to get there
and what to do there?
      Please e-mail me soon. Good luck with you!
                                                                                                                     Yours,
                                                                                                                  Xiaoxing

From: Xiaowang@sina. com
To: Xiaoxing@yahoo. com
Dear Xiaoxing,
     Glad to hear from you. _________________________________________________
_____________________________________________________________________       
     Best wishes!
                                                                                                                              Yours,
                                                                                                                          Xiaowang
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