4. D 主旨题。文章在开头就交代了写作的目的，有各种不同的理由说明了为什么癌症似乎在上升，而从后面的几段我们知道科学家们正在研究一种新的早期诊断cancer的方法。

　　B段

　　As a college student, I have planned my future career goals. I would like to work as a sales assistant in a computer company, then a sales manager and finally boss of my own company.

　　At the very beginning, I plan to find a job in a famous company producing computers, in which all the staff are fully happy at work and I can experience job satisfaction most of the time. Only such kind of company can provide me with good working atmosphere and eagerness to learn more so as to get well prepared for my future profession.

　　At first I want to be a sales assistant and always keep myself busy working in and out of the company, such as answering telephones, doing repair work, even cleaning the rooms. Although the salary may be low, I will seize every chance to learn from other staff. In my spare time, I will take some courses so as to get more qualifications and experience in this field. In three or five years, I am determined to become a sales manager who is responsible for the selling of the computers. I will interview as many customers as possible and do market research and improve our products. Meanwhile I will take care of my staff so as to make them eager to work to the best of their abilities.

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