【单选题】

Most worthwhile careers require some kind of specialized training. Ideally, therefore, the choice of an (21) should be made even before choice of a curriculum in high school.

Actually, (22) , most people make several job choices during their working lives, (23) because of economic and industrial changes and partly to improve their position. The "one perfect job" does not exist. Young people should (24) enter into a broad flexible training program that will fit them for a (25) of work rather than for a single joB、
Unfortunately many young people have to make career plans (26) benefits of help from a competent vocational counselor or psychologist. Knowing (27) about the occupational world, or themselves for that matter, they choose their lifework on a hit-or-miss (28) . Some drift from job to joB、Others (29) to work in which they are unhappy and for which they are not fitteD、
One common mistake is choosing an occupation for its real or (30) prestige. Too many high school students or their parents for them choose the professional field, (31) both the relatively small proportion of workers in the professions and the extremely high educational and personal (32) The prestige that people tend to (33) to a profession or a white-collar job is no good reason for choosing it as life’s work.
(34) , these occupations are not always well paiD、Since a large (35) of jobs are in mechanical and manual work, the majority of young people should give serious (36) to these fields.
Before making an occupational choice, a person should have a general idea of what he wants (37) life and how hard he is willing to work to get it. Some people desire social prestige, others intellectual (38) . Some want security; others are willing to take (39) for financial gain.Each occupational choice has its demands as well as its (40) .
A、chance B、basis C、purpose D、opportunity