We often use slang expressions when we talk because they are so vivid and colorful. However， they are usually out of place in formal writing / because of a number of drawbacks. / They go out of date quickly / and become tiresome if used too much. / And they may communicate clearly to some readers but not to others. / In general， we should avoid the use of slang in our writing.要特别注意失分点，如介词、冠词、单复数、标点符号等。
英语八级，讲的是英语专业八级，普通的大学生英语等级最高是英语六级，英语专业的才有英语专业四级、专业六级、专业八级，两者考察的方向和侧重点不一样，普通四六级偏重运用能力，日常化英语，专业四级八级偏重读写能力，八级更偏重语言文化和历史。
英语专四全称是英语专业四级考试，该考试面向全国综合性大学英语专业的学生，一般在大二时考。雅思是国际英语水平考试，主要针对出国留学群体，该考试由英国文化协会、剑桥大学考试委员会和澳大利亚教育国际共同开发管理。
