Dubaiisacityofbigbusiness，expensivehotels，skyscrapers（摩天楼），andshoppingmalls．Intheearly20thcentury，Dubaiwasasuccessfultradingport．PeoplefromtheworldstoppedinDubaitodobusiness．Butitwasstillasmall
Dubai is a city of big business，expensive hotels，skyscrapers （摩天楼），and shopping malls．In the early 20th century，Dubai was a successful trading port．People from the world stopped in Dubai to do business．But it was still a small city，and most people lived as fishermen and businessmen．Then in 1966，oil was discovered．This brought a lot of money into the area，and soon Dubai began to change．
Today Dubai is one of the world's most important business centers．In fact，each year the city gets its money mainly from business，not oil．
Recently Dubai has attracted more and more visitors from abroad．They come to relax on its beaches，and every year，millions visit just to go shopping!
Dubai is also one of the world's fastest growing cities．Many tall buildings are built in months．The city also has many man-made islands．One of these，the Palm Jumeirah，is like a palm tree and is very beautiful．
The city is still an amazing mix of people from different countries．People from 150countries live and work in Dubai，and foreigners now outnumber Dubai natives by eight to one!
Many people welcome the city's growth．But an increasing number of Dubai natives worry about the speed of change．As a Dubai native says，"Wemustalwaysrememberwherewecamefrom．Ourkidsmustknowweworkedvery，veryhardtogetwherewearenow，andthere'salotmoreworktodo．"
21．Why did people stop in Dubai in the early 20th century？___
A．To relax． B．To buy oil． C．To go shopping． D．To do business．
22．In the last paragraph，what does the underlined part mean？___
A．We should always visit Dubai．
B．We should learn from foreigners．
C．We must always remember our past．
D．We don't have to worry about the future．
23．What's the main idea of the passage？___
A．Dubai is growing very fast．
B．Dubai was a big city before 1966．
C．Many tall buildings are built in months．
D．Many tourists come to rela