Practitioners, no matter what occupation they are engaged in, should love each other, strive for perfection, do their duty, be proud of their efforts, be ashamed of leisure and be ashamed of their aversion to work. This is the requirement of professional ethics. The options are as follows:

First, the requirements of dedication.

B, the requirements of fairness.

C, the requirements of serving the masses.

D, the requirements of honesty and trustworthiness.

Analysis: The main contents of socialist professional ethics include dedication, honesty and trustworthiness, fairness, serving the masses and contributing to society. In the stem of the question, it is pointed out that it is necessary to "do a line and love a line" and "love a line and drill a line". It embodies the requirements of love and dedication in socialist professional ethics.

A, love and dedication means that practitioners should fully realize the social value of their profession and realize that there is no distinction between high and low occupations, and they all serve the people. The division of occupations is essentially that people do their own things in an organized way, and people love their jobs. Respect your career, do what you do, love what you do, and specialize in what you do, so I chose item A.

In item B, fairness means that employees are honest and fair. We should not only have integrity, handle affairs fairly, and not abuse power for personal gain, but also enforce the law impartially, so as to be fair, just and impartial. It is neither superior to others, nor supreme in power, nor emotional, nor mercenary, so item B is excluded.

Item C, Serving the masses, means that employees should serve the people wholeheartedly in their professional activities. Serving the people is the soul of the profession, and we should be enthusiastic, patient, open-minded and sincere in the service process. Everything starts from the interests of the masses, solves problems for the masses, makes suggestions for the masses, and improves service quality, so item C is excluded.

Item D, honesty and trustworthiness refers to the excellent quality of employees who tell the truth, do practical things, don't lie, don't cheat, keep their promises, keep what they say and do what they say. Honest and trustworthy, we must have high-quality products, high-quality services, and strictly abide by the law. Only in this way can we win the trust of the people and obtain good social and economic benefits, so item D is excluded. So, the answer to this question is a.

People who love their jobs and are dedicated to their work make great contributions.

Only those who love and respect their jobs will be diligent in their jobs. Only by constantly learning, being meticulous and striving for perfection can we make lofty and great contributions to society and the country. Love and dedication is an ordinary dedication, because it is something that everyone can do and should have; Love and dedication are also great dedication, because greatness comes from the ordinary. Without ordinary love and dedication, there is no great dedication. People with dedication and dedication will always be the backbone of a strong nation.

A large number of good cadres of the Party and the people, such as Jiao, Li and Yang, work hard in their posts and work diligently for the people. When the SARS epidemic struck, a large number of ordinary doctors, nurses and researchers stepped forward and risked their lives. Rushing to the front line saved the lives of compatriots struggling to die, and some people gave their precious lives for it. The great cause of building a well-off society in an all-round way is calling for hundreds of millions of ordinary and great people to dedicate themselves to their jobs.