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21. The causes of people's longevity today
In general, people are living longer now. Discuss the causes of this phenomenon. Use specific reasons and details to develop your essay.
『分析』
现象描述：20世纪初全球平均年龄(life expectancy)大约45岁。到20世纪末，这个数字已经增长到70岁左
右。
人们越来越长寿的原因：
越来越好的饮食条件，饮食卫生，越来越科学的饮食模式
越来越发达的医疗技术、越来越完善的医疗保健系统
经济稳定、社会稳定。极端的例子：前苏联(the previous Soviet Union)解体(disintegration/breakup)
后，俄罗斯的平均年龄大幅度下降
『范文』
Among various factors that contribute to today's longevity of people are three most obvious ones: the improvement of food conditions, the development of modern medical technology, and finally current stability of economy in our country.
Food conditions are better than before and are still being developed with a rapid pace. First of all, foods are more hygienic. People today drink untainted mineral water, sterilized skim milk, which are cheaply supplied in supermarkets. Furthermore, foods are more nutrient. Not to mention various carefully designed nutrient products. People can just ignore the possibility of being dystrophic, since they can keep nutrient balance by simply taking a cheap pill of vitamin compound every day. Another essential improvement that contributes to people's longevity is swiftly developing medical technology. Development of modern medical technology has always been amazing. Certain diseases such as tuberculosis, pneumonia, and dysentery are now easy to remedy with low expenses, but in the past, they are all probably lethal ones. The dental technology seems developed little except its exorbitantly charged bill, yet the simplest technology contributes to people's longevity most. It is not difficult to imagine that if an individual who lived in the past got a toothache, without certain dental care which is common today, he was certainly in an awful prospect: he might even die of a toothache!
Current societal and economic stabilization is also a very indispensable factor. People have less pressure in a more stable society, the less pressure they suffer, the healthier they are. Today's ideal stabilization even provides people an opportunity to secure their future—buy insurances. Various types of insurances are readily available, which make people feel safe, and have to a large extent reduced people' anxieties, and therefore indirectly contribute significantly to the longevity of people.
22. What makes a good co-worker?
We all work or will work in our jobs with many different kinds of people. In your opinion, what are some important characteristics of a co-worker (someone you work closely with)? Use reasons and specific examples to explain why these characteristics are important.
参见：[15]
『范文』
Healthy co-workers relations are crucial for the success of business. Since average workers spend at least 8 hours a day with their co-workers, their relationships with their co-workers are among the most important relationships in their lives. The best kinds of co-workers will possess team spirit, be hard working, and have a sense of humor.
Co-workers with team spirit will put the needs of the company and their co-workers before their own needs.
For instance, an employee with team spirit might put in uncompensated overtime to help a co-worker finish a project before a big deadline. If the worker who needs help does not meet the deadline, the whole company might lose an important client. If co-workers help each other, even though the rewards might not be immediately apparent, each individual will gain more than if they worked separately.
A good co-worker needs to be hard working. This is the responsibility of every worker in any company. Just as the failure of employees to cooperate will hurt each member of a company, failure of each worker to perform to the best of his/her ability will hurt the company. It will not only lower that particular worker's productivity, it will also damage the co-workers' morale. If I see a co-worker of mine slacking off, I might begin to think to myself, "Why should I work hard? I can slack off like my co-worker and still make the same amount of money!" Hard work is not only important for productivity; it is also a crucial prerequisite of team spirit. Finally, good co-workers need to have a sense of humor. Working at any company can be very stressful. Even though it is necessary for everyone to work hard, that does not mean that work cannot be fun. Since co-workers spend so much time together, being able to joke and laugh each other is also important. If an employee is perceived by his/her co-workers as a humorless workaholic, then they might not want to go along with him/her. His/her lack of humor hurts team spirit, and not only irritates the people around him/her, but also damages the whole company.
23. Is it advisable for a teenage student to have a part-time job?
In some countries, teenagers have jobs while they are still students. Do you think this is a good idea?
Support your opinion by using specific reasons and details.