下列哪项因素与患病率的变化无关（）。 A.发病率的升高或下降

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问题单项选择题 A1/A2型题

下列哪项因素与患病率的变化无关（）。

A.发病率的升高或下降

B.病死率的升高或下降

C.人口总数自然增加或减少

D.治疗水平的提高或降低

E.存活时间长短

答案

参考答案：C

判断题

企业与外部单位联合开发是指企业联合外部单位进行软件开发，由本单位财务部门和网络信息部门进行系统分析，外单位负责系统设计和程序开发工作，开发完成后，对系统的重大修改由网络信息部门负责，日常维护工作由财务部门负责。

填空题

根据句意，用括号里所给单词的适当形式填空。

1. He is friendly to his classmates, and has made many______(friend) here.

2. After two days off on weekends, we always feel very ______(relax).

3. —What about ______ (have) a farewell (再见) party after the exam?

—Sounds great.

4. Rich or poor, young or old, we all have problems. And unless we deal with them,

we can _____(easy) become unhappy.

5. —Excuse me. Where's Mr Wang?

—He _____ (play) football on the playground with his students.