A
Millions of people all over the world use the word okay．In fact，some people say the word is used more often than any other word in the world．
It may be common，but no one can seem to agree on how the "OK" came to be．
Okay means "all right" or "acceptable"．It expresses agreement or approval．You might ask your brother, “Is it okay if I borrow your car？”Or if someone asks you to do something，you might say，"Okay，I will．"Still，language experts do not agree about where the word came from．
Some people say it came from the Native American Indian tribe known as the Choctaw. The Choctaw word "okeh" means the same as the American word okay. Experts say early explorers in the American West spoke the Choctaw language in the nineteenth century. The language spread across the country．
But many people dispute（争论）this．
Language expert Allen Walker Read wrote about the word okay in reports published in the 1960s．He said the word began being used in the 1830s．It was a short way of writing a different spelling of the words "all correct．"Some foreign﹣born people wrote "all correct" as "o﹣1﹣1k﹣o﹣r﹣r﹣e﹣c﹣t．"and used the letters O．K．
Other people say a railroad worker named Obadiah Kelly invented the word long ago．They said he put the first letters of his names﹣O and K﹣on each object people gave him to send on the train．
Still others say a political organization invented the word. The organization supported Martin Van Buren for president in 1840．They called their group，the O．K．Club．The letters were taken from the name of the town where Martin Van Buren was born﹣Old Kinderhook，New York．
Not everyone agrees with this explanation，either. But experts do agree that the word is purely American．And it has spread to almost every country on Earth．
21.What is the text mainly about？
A．How the word Okay came into being．
B．The different meanings of the word Okay．
C．The dispute of the origin of the word Okay．
D．How widely the word Okay is used．
22.What does the underlined word Okay express in the 2nd example in Paragraph 3？
A．Promise． B．Admission． C．Permission． D．Correctness．
23. What do language experts agree on？
A．Okay is the most widely﹣used word．
B．It came from some Indian dialect．
C．It was invented by a politician．
D．It is first used by Americans．
