1)現在大城市裡有很多城市寄生蟲，他們以乞討為生
2)這種現象帶來的影響
3)如何解決這一問題
【思路點撥】
本題屬於提綱式文字命題。提綱第1點要求指出一種不良現象，提綱第2點要求分析該現象帶來的.影響，提綱第3點要求說明如何解決該問題，由此可判斷本文應為問題解決型作文。
根據所給提綱，本文應包含以下內容：描述大城市中的城市寄生蟲現象;分析城市寄生蟲現象帶來的影響;說明應該如何才能有效地減少這種城市寄生蟲。
【參考範文】
Parasites of Big Cities
Nowadays there are many beggars in big cities, who are called parasites of big cities. Some are begging something to eat for survival, while most of them are professional beggars according to the survey. In addition to plain beggars in rags, there are many disabled beggars and begging families with the children as the leading character. Besides, in recent years, student beggars have appeared.
No doubt, these parasites of big cities have brought great bad effects. On the one hand, their asking a reward without labor is a burden on the society and influences the city image. On the other hand, many pretended beggars cheat peoples sympathy by fake stories and experiences, which is very harmful to society.
