【正确答案】
When it comes to what kinds of job to take up upon graduation, a considerable proportion of college students answer that their ideal jobs may be lawyer, or teacher, or businessman, or any other professions that can ensure them fame and wealth. Contrary to the widely-held thought, I prefer to keep my first resolve to be a scientific researcher. In other words, I have decided to devote myself to the field of scientific research.
The reasons why I have made this choice can be expressed as the following. On the one hand, scientitle research is one of the most important and noblest professions in the world, whose development will benefit the whole humankind. On the other hand, having studied in school for so long a time, I think it is better for me to make full use of what I have learned these years.
For all these reasons, I have worked hard on my college performance and have achieved good results. At the same time, in order to increase my scope of knowledge, I have carefully selected some optional subjects that might be useful in the future.

【答案解析】[解析] 本文的开始段点明所要阐明的主题：我理想的职业。中间段为文章的主体，从两方面讨论了我选择这个职业的原因。结束段应表明我为理想的职业做了哪些准备。