20. It has been proved that every substance, no matter what it is, is made up of atoms.
③ 分论点：There are some reasons behind this attitude。
2. It is (has been) estimated that the world's population could reach 6 billion by the end of the century。
③This issue has drawn widespread attention。
空调：Air-conditioner is a kind of invention in the 20th century, which can make the temperature comfortable。
29. I take it for granted that they will support this idea. I regard it as natural that they will agree to this idea。
③In the second place, … constitutes a major cause of this situation。
④Only when these practical measures are taken can this problem be dealt with step by step and gone with the wind。
7. It is clear that the enemy has no desire for peace。
Nowadays, with the fast development of Information Technology, Chinese citizens are attaching more and more importance to it. Some schools and universities have even included Information Technology in their required courses, which has led to different opinions. Some people think it is unnecessary to make IT courses required, and students are supposed to take traditional courses. Oppositely, other people think it is necessary to do so, for China and its people should keep pace with the times. Either way, it is a good thing that Information Technology has attracted people's attention.
As is vividly depicted in the picture which seems to be humorous and ridiculous but thought-provoking on the second thoughts, the most striking feature that impresses me profoundly is that Spring, one of the realest men throughout the history of mankind all around the whole world that I have ever seen in my entire life, who is thebest that there ever was and the best that there ever will be, is a good teacher that is momentous and fundamental to anyone who want to win the future what the light is vital and significant to the people who desire to break through the dark，and that can support us to realize our vision and achieve our goals no matter how dark the world around us becomes and how hard the way ahead will be, because without him, we could have done nothing, including dream, success, hope and future。
10. There is no doubt that you will be helped by others if you have any difficulties.
②In the first place, … is the root cause of this crisis。
30. In a certain sense, a successful scientist is a person who is never satisfied with what he has achieved。
“网络的利与弊”Most of individuals spend too much time on their computer terminal rather than relating to people in the real world。
17. It is certain that we have a long way to go。
第二段：解析原因(4句卡塔尔(英语：State of Qatar)
11. It seems certain that they have made a series of experiments。
④原因如下：1，2，3…The reasons can be listed as follows。
21. It has been decided that we are going to build a railway whose base must be completed within this year。
4. It can be seen from this that there is no difficulty in the world we can overcome. 5. As is known man is the product of labour。
6. It is a common saying that man who has a settled purpose will surely succeed。
考前必读，四六级作文必背叁18个基本点句式。 ①Accordingly, the solution to this problem should be varied as well。
22. It is obvious (evident) that the success of the innovation depends on our concerted efforts。
①It is obvious that the causes of this issue are diverse。
25. What is more important, the agreement they have negotiated is being carried out.
14. As we know, it was not until recently that the problem was solved。
万能句型：The phenomenon of …has been known for years. 某种现象或难题遍布存在或长久。
26. We will be successful as long as we persevere。
②Yet at the same time, many problems have arisen, a serious one of which is … (主题词)
①万能句型：What this thought-provoking drawing mirrors is the phenomenon that …
27. Frankly speaking, what you call the truth may not apply to things happening here.
翻译：最终，。。。(原因三要名词卡塔尔(英语：State of Qatar)在此生机勃勃主题材料中当做要角。