1道英语阅读题Most people have jobs.They go to work nearly every da

1道英语阅读题
Most people have jobs.They go to work nearly every day.Some people are lucky.Either they
have very interesting jobs or they make a lot of money.Most people are not so lucky.Either their
jobs are not very interesting or they don't make much money.The most interesting jobs are often the
most difficult.People take a long time to learn how to do them.Doctors study for at least six years
after finishing school.
Some young people have interesting and high-pay jobs.Many young players do their work
successfully.Football and tennis stars are usually under 35 years old.Older'peopje usually cannot
play these sports very well.They cannot move fast enough.Golf,however,is a good sport for older
people.Many golf players are quite old,but they can play it successfully.
Most people work until they are 60 0r 65 years old.Then they retire and have a lot of free time.
Some people never retire though.These people usually have very interesting jobs.Writers,artists,
scientists and actors usually work until they die.Their work is their life.
问：what is the main idea of this passgae?
A.there are many different kinds of jobs.
B.intesesting jobs are usually also difficult.
请给出理由.