【正确答案】A good education and income are usually considered necessary for happiness. Though both may contribute, they are only chief factors if the person is seriously under educated or actually suffering from lack of physical needs. The rich are not likely to be happier than the middle-income group or even those with very low incomes. People with college education are somewhat happier than those who did not graduate from high schools, and it is believed that this is mainly because they have more opportunity to control their lives. Yet people with a very high income and a college education may be less happy than those with the same income and no college education.