结构一：107 words

　　It is generally believed that...is a hot topic which is widely talked about both at home and abroad .Now our government attaches great importance to solving this problem. Scientists in this field have put forward a number of suggestions tending to relieve it. To begin with, we should...Furthermore,...It is clear that...

　　People, however, differ in their opinions on this matter. Some people think that... According to them, all of us should...Others argue that... In their opinion, nobody can... without... There is no doubt that... As a consequence... In short, I firmly support the view that... It is because... So my conclusion is that...

　　结构二：127 words

　　There is no denying the fact that ... is popular topic which is much talked about not only by..., but also by... It is generally thought that ... The reasons for ... are as follows. To begin with, ... Secondly,... Therefore, we should attach great significance to solving the problem.

　　There are, I think, at least two possible ways to cope with it .The first way to tackle it is to appeal to the authorities to take drastic measures to (do)... The other policy that is worth adopting is to work out new regulations to (do)... Only in this way can we succeed in dealing with the problem in the near future.

　　To conclude, it seems obvious ... So the prospect we are looking forward to will be both bright and encouraging.