四级作文一 The challenges of living in a big city
Never in our history has the phenomenon that living in a big city become so common. With cities growing larger and larger, there has been a steady rise in the number of people who flood into those big cities. Obviously, it will give rise to a host of trials to the new citizens.
First and foremost, people will have to face with the high living expenses. For most people in big cities, they have to rent to live and the cost of daily products may also see a rise.
Then, the challenge of working under great pressure couldn’t be denied. While having high salaries, people living in big cities will also encounter with intensive working pressure.
Finally, there may be other difficult tasks like long commute distance, jammed traffic, poor air conditions and etc., dealing with such issues can be really challenging.
Taking all these into account, there are still great amount of people choose to work and live in big cities, because great challenges always come along with great opportunities.
四级作文二 The challenges of starting a career after graduation.
Nowadays there is a growing concern over starting a career after graduation for the newly graduates. For years, the society has witnessed that a growing number of newly graduates remain unemployed after graduation, and the challenges may as follows:
First, students upon graduation may be overwhelmed by the social reality that their majors are not so correspond to the real work. Especially for the liberal arts graduates, because it's challenging to transfer theoretical knowledge into practical use.
Then, the newly graduates will have to face the challenge that most companies would prefer to hire employees with working experience. It is true that many students graduate with zero experience.
Besides, the high living expenses after graduation, taking rent as an example, is another great trial that can’t be overlooked.
There is sufficient evidence to show that starting a career after graduation is certainly challenging. But for the newly graduates, they still need to stay optimistic. The long life path is still at its beginning and the great challenges always come along with great opportunities.
四级作文三 The challenges of studying abroad
Nowadays, with globalization making the world more interconnected, a trend of accepting higher education has been on the rise. There are many students considering studying abroad, and here are some of the challenges they may confront with.
The first one is being exposed to a totally exotic environment. People who studied abroad will be open to everything new and strange. On social level, they also meet a diverse range of counterparts. Sometimes it is no easy to become the ice-breaker.
The other challenge may come from their family, or to be specific, the oversea students will be more likely to be homesick, especially for those who are in their first year, and their parents will share that feeling with them.
Besides, we shall not forget the obstacles of culture and language. It is quite often that even if they can understand every single word, they will still fail to grasp the true meaning.
Despite all these challenges, there are still great amount of people choose to study abroad, because great challenges always come along with great opportunities.
解析：
本次考试考查的是论说文，难度适中。三个话题——就业、留学、在大城市居住，均在过往考试中考察过，只是程度的差别，即便是限定在论述挑战，相信同学们也不会感到太陌生。
建议文章结构：
第一段：引出这个问题；
第二段：分点阐述具体的挑战内容；
第三段：简述应对的心态；
开头部分要简明，引出话题，正文部分结构要清晰。
就词汇而言，关键词challenge被大量使用，考虑到词汇的多样性，可以使用trial, difficult task，obstacle替换，也可以变换词性(challenge→challenging)等来充实文章。
语法上而言，句式运用丰富，有从句，复合句，倒装句等句型：
倒装句：Never in our history has the phenomenon that…
同位语从句：…will have to face the challenge that most…
主语从句： “…number of people who flood into those big cities.”
物称主语：“the society has witnessed…”
分词结构：“There are many students considering studying abroad…”