Answer the questions(no more than thirteen words)

Answer the questions(no more than thirteen words)　　One of the most difficult questions to answer is how much a job is worth. We naturally expect that a doctor's salary will be higher than a bus conductor's wages. But the question becomes much more difficult to answer when we compare, say, a miner with an engineer, or an unskilled man working on an oil-rig in the North Sea with a teacher in a secondary school. What the doctor, he engineer and the teacher have in common is that they have devoted several years of their lives to studying in order to obtain the necessary qualifications for their professions. We feel instinctively that these skills and these years, when they were studying instead of earning money, should be rewarded. At the same time we recognize that the work of the miner and the oil-rig labourer is both hard and dangerous, and that they must be highly paid for the risks they take.　　Another factor we must take into consideration is how socially useful a man's work is, regardless of the talents he may bring to it. Most people would agree that looking after the sick or teaching children is more important than, say selling secondhand cars or improving the taste of toothpaste by adding a red stripe to it. Yet it is almost certain that the used car salesman earns more than the nurse and the research chemist earns more than the schoolteacher.　　Indeed, this whole question of just rewards can be turned on its head. You can argue that a man who does a job which brings him personal satisfaction is already receiving part of his reward in the form of a so-called “psychic wage'', and that it is the man with the boring, repetitive job who needs more money to make up for the soul-destroying monotony of his work. It is significant that those jobs which are traditionally regarded as "vocations'' nursing, teaching and the Church, for example continue to be poorly paid, while others ' such as those in the world of sport or entertainment, carry financial rewards out of all proportion to their social worth.1.Why should the professional man such as the doctor be well-paid?2.It is difficult to compare a teacher with a miner because a miner's job is unskilled but _________________________.3.Considering _____________,the public would agree that the nurse should earn more than the used-car salesman.4.According to the passage,why should a man who does a dull job get higher pay?