题目

Miss Brown is from 46     ( 加拿大).She is an English teacher in No.2 Middle School of Zhuji.She likes 47     (居住) here. She thinks Zhuji is a  48          (美丽的) city. But she doesn’t know   49    (许多) Chinese. So she  50      (去) to Chinese classes every week. She works very  51         (努力地).Now she can   52      （谈论）about something  53     ( 用) Chinese. She always says the Chinese people are very   54  . (友好的) and like to help 55    .(其他的人)设函数f(x)=|2x-1|+|2x-3|,x∈R(Ⅰ)解不等式f(x)≤5；(Ⅱ)若的定义域为R，求实数m的取值范围.