[originaltext]University students are different. They come from different parts

University students are different. They come from different parts of the country, speak various dialects, and follow their distinctive regional customs. However, (19)a closer look at their purposes of learning at university will enable us to classify them roughly into three groups: those who learn out of instinct, those who learn for a promising future, and those who learn with no definite purposes. Firstly, there are a handful of students who learn without fatigue simply because they like to learn. (20)They read a great deal of British and American novels because they are keenly interested in literature. Others sit in front of the computer screen, working on one new program after another all day and all night because they have discovered beauty in complicated signal patterns, and dream of becoming “Bill Gates” one day. (21)Secondly, there are job-oriented students who work hard for a better career. It is arguable that the majority of university students fall into this category. After enrolling in the hottest specialty of the moment, they throw themselves into books, whether they like them or not, so as to absorb the most knowledge and to obtain all the available certificates, which may serve as a competitive edge in the cut-throat human resources market in four years’ time. Thirdly, there is a small fraction of students who learn without an aim. They take courses, finish assignments, enjoy life on campus, but lead a directionless life. They do not know what they are doing, nor what they are willing to do, nor what they will be doing after college. They are a group of “sleepers”.
Questions 19 to 21 are based on the passage you have just heard.
19.What’s the basis of classifying university students into three groups?
20.Why do many students who learn out of instinct read lots of British and American novels?
21.Which group do most university students fall into?