One day a rich man took his son on a trip to the country in order to show his son if the poor lived，

　　so he could be thankful to his wealth．They spent a couple of days and nights on the farm of that

　　would be considered a very poor family．On their return back，the father asked his son to explain

　　what he had learnt．The boy，who had remained silent and deep in thought on the journey home，

　　replying in a way that shocked his father．

　　The boy said he wanted to become∧farmer．He envied the farmers who had the beautiful night star

　　to give them light while her family had only expensive lanterns．His wish was to have a farm where

　　he could go swimming in an endless river instead of the garden pool in their home．Finally the boy

　　finished by saying，"Before the trip I thought we were rich but today I have learnt who is true rich．"

　　With this，the boy got up and walked away，leaving his father sat on their comfortable sofa，totally

　　speechless．

　　详

　　1．if 改为how 考查句意理解以及从属连词 本句的意思是：有一天，一位富人带着他的儿子去乡村旅行以便让他的儿子看看穷人是如何生活的；此处用来引导宾语从句，意为：如何；故用how．

　　2．to改为for 考查固定短语 bethankfulto后面跟人，表示感谢某人；bethankfulfor后面跟事物，表示对某事物表示感谢；由于此处之后接的是wealth（财富）；故用for．

　　3．that改为what 考查连接代词 此处用来引导宾语从句，由于该从句中缺少主语，故用连接代词what．

　　4．去掉back 考查return的含义 由于return"返回"相当于"goback/getback/comeback"，即它本身就含有back的意思，其后不能再跟back；故去掉return之后的back．

　　5．replying改为replied 考查谓语动词 此处在句中作谓语，根据上文可知，此处讲述的是发生在过去某一天的事情，应使用一般过去时；故用replied．

　　6．farmer前加a 考查不定冠词 此处用来修饰单数名词farmer，表示泛指一位农民，故在farmer前加a．

　　7．star改为stars 考查名词的单复数 此处指的是：许多美丽的夜星；由于star为可数名词；故用stars．

　　8．her改为his 考查人称代词 此处用来修饰名词family，指代的是男孩的家；故用his．

　　9．true改为truly 考查副词 此处用来修饰形容词rich，故用truly．

　　10．sat改为sitting 考查固定搭配 leavesbdoing指让某人保持某动作或状态，留下某人…；此处指的是：男孩站起来走开了，留下了他的父亲坐在他们舒适的沙发上，完全说不出话来；故用sitting．