单选题 Attitudes towards lifelong employment are changing because ______.

A、 job changes have career advantages
B、 it's boring to work in only one company
C、 only the employer benefits from such employment
D、 stable employment seldom offers better opportunities

【正确答案】 A

【答案解析】[分析] 答案在最后一句话“…that changing firms call have career advantages．”(变换工作会有事业的优越性。)B项仅在一家公司供职是很无聊的；C项只有雇主才能从这种终身中获利；D项稳定的工作很少提供良好的机会，文中内容并没有涉及到这些内容，故本题答案为A。