文档介绍：第一段
对比法
数据法
A public debate has arisen concerning ___.
Recently, the problem of ___ has aroused people’s concern.
It e as no surprise to learn that ___.
Nowadays, people in growing number are being plain that _.
One of the most serious problems many people talk about centers on ____. (Washington Post)
One of the pressing problem facing our nation today is __. (VOA)
Never before in history has the issue of ___ been more evident than now. (VOA)
___ is a new and bitter truth we must learn to face.
There is a general discussion these days over ___. One of the questions under debate is whether ___.
There is a growing worldwide awareness of ____.
Whether __ is a good thing or not is very popular topic, which is often talked about not only by city residents but by farmers as well. (TOEFL)
For years, extensive research efforts have been focused on ___. (BBC)
_____ is a delicate problem with which our country is confronted. (BBC)
Recent years have been a tendency that increasing number of ___. (IELTS)
Perhaps the most dangerous phenomenon gripping the nation today is ___. (CNN)
The prevalence of ___ has been a big problem in our society. Almost every day newspaper carry articles pertaining to problem. Despite measures have been implemented to deal with this problem, it still remains a serious threat. (BBC)
Not a single day passed without the report of ___.
There has been undesirable trend in recent years towards __. (Canada Post)
Recently, an increasing number of reports about ___ have appeared in the media. (Australia Today)
There is no denying the fact that ___ is an extremely serious problem. (New York Times)
Why? There are a number of factors accounting for this phenomenon.
Many reasons should be responsible for this unpleasant situation.
The main reasons probably lies in the following points.
The explanation for this problem involves many factors. (TOEFL)
原因过度句
It’s no easy job to find the reasons for this tendency which involves plicated factors. (IELTS)
Wh