题目内容

截至2014年7月23日,全球共有21个国家累计报告中东呼吸综合征(MERS)实验室确诊病例837例,死亡291例,利用该信息计算得34.8%是

A. 患病率
B. 死亡率
C. 病死率
D. 相对比
E. 发病率

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某医师治疗2例视网膜炎患者,1例有效,下列哪项说法是错误的

A. 该医生治疗视网膜炎的有效率为50%
B. 最好用绝对数表示
C. 必须用率表示时,可列出可信区间
D. 分母太小,用相对数表示不可靠
E. 不能得知总体有效率

Nowadays, the mobile phone is so popular that (1) everybody has one. It has become a part of our life. It is not only a tool for communication, but also a form of entertainment.A mobile phone has many functions that can make our life easy. For example, it’s easy to (2) , so we can make phone calls and send (3) anytime and anywhere. A mobile phone can be used as a (4) . We can search on the Internet and read the latest news on mobile phones. Some mobile phones can also take photos, and we can send and (5) them with our friends.

Julianna lives in Brazil.

A. 对
B. 错

Julianna's neighbourhood is dangerous.

A. 对
B. 错