英语四级 待批改作文：
　　With the progress of society and technology,cell phones play a more important role in individual life.An investigation shows that the number of mobile phone users are increasing rapidly.In 1990,it merely have 200,by 2005,the number increased from 500 to 900.
　　There are many factors for the dramatic growth.In the first place, cellphone is easy to carry,and saves students a great deal of time by sending short message to their relatives and classmates.In the second place,another benefit obtained from cellphone is convenience for people to keep up with the latest information they need.
　　There is no denying that cell phones bring about far-reaching impacts on personal life.It must be admitted that,however,there still exist some problems about cellphone such as certain physical disease.Therefore,cellphone still has a long way to go before it becomes mature.
　　作文批改如下：
　　With the progress of society and（加the improvement of） technology, cell phones play a more important role in individual life. An investigation shows that the number of mobile phone users are（改为is） increasing rapidly. In 1990, it merely have(改为had) 200,by 2005,the number increased from 500 to 900.
　　There are many factors for the dramatic growth. In the first place, cellphone（加空格） is easy to carry（改为take）, and saves students a great deal of time by sending short message to their relatives and classmates. In the second place, another benefit obtained from cellphone（同上） is convenience for people to keep up with the latest information they need.
　　There is no denying that cell phones bring about far-reaching impacts on personal life. It must be admitted that, however, there still exist（加s） some problems about cellphone such as certain physical disease. Therefore, cellphone still has a long way to go before it becomes mature.(主谓不搭)

　　标点符号与后面的单词空一格。The number of 是“…的数量”的意思，谓语动词用单数。A number of 是“大量的”的意思，谓语单词用复数。表达能力需要提高，最后一句明显是中式英语的表达。第二段是要写原因的，并不是让你写手机带来的好处。有跑题之嫌。