若不等式$\frac{1}{n+1}+\frac{1}{n+2}+\cdots +\frac{1}{2n}>\frac{m}{72}$对于大于1的一切正整数n都成立，则正整数m的最大值为  （ ）

人的手被热水烫了，在缩手的同时感到又烫又疼，以下说法不正确的是（   ）

    Keeping a diary in English is one of the best ways to improve our English writing ability.

    Compared with other forms of writing, it is shorter and takes ____(little) time. It can help us to develop the habit of thinking in English.____we stick to this practice,____ (gradual) we'll learn how to express (表达) ourselves in English. In keeping a diary in English, we certainly run up against many ____ (difficult). In the first place, it often ____(happen) that we have trouble ____(find) proper words and phrases to give expression to our mind. And____ is very hard for us to put them into English properly.

    As far as I am____(concern), my suggestion is that we should always have a notebook and a Chinese­English dictionary within easy reach. We can also turn to our English teacher for help, if necessary. In short, I believe that it is ____great use to keep a diary in English for the development of ____ (we) writing skills.