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
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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
Alejandra lives in New York.
A. 对
B. 错