Pay attention! It's time the world got this straight.

The world's unofficial Girl Scout cookie sales champion is a 14-year-old who combined the cuteness of the girl next door and the promotional genius of P.T. Barnum and turned it into a bonanza of nationwide publicity and cookie sales. Her name is Elizabeth Brinton, and she lives in Falls Church.

The world's unofficial Girl Scout cookie sales runner-up is a 14-year-old who combined the cuteness of the girl next door and the promotional genius of P.T. Barnum and turned it into a bonanza of nationwide publicity and cookie sales. Her name is Marketa Andrews and she lives in New York City.

"When people think of the Girl Scouts, they tend to think of the most well-known scout," said Brinton. "Unfortunately, there are two well-known scouts. They tend to blend us into one super Girl Scout."

For Brinton, the confusion is especially frustrating. Last year, she sold a record 15,000 boxes of cookies -- 6,000 more than Andrews, according to Girl Scout figures -- and her career total of 50,000 boxes is at least 10,000 higher than Andrews'.

Nonetheless, Brinton and her mother Noel said that for the past several months they have sat dumbfounded while the television shows "Good Morning America" and "Hour Magazine," as well as Parade and Family Circle magazines, declared Andrews the world's greatest cookie seller.

Even the "CBS Morning News" -- the program on which Phyllis George once dubbed Brinton the "Cookie Queen" -- had Andrews on the air in March and declared her the "greatest cookie salesperson in the entire world."

The Cookie Queen was not amused.

"Naturally, I was upset," said Brinton, who for years has maintained a sales rivalry with Andrews that has remained just this side of good-natured. "I have worked very hard to set these records."

There have been other indignities. Recently, when Brinton arrived for a promotional appearance before local automobile dealer group, a name tag with Andrews' name was there when she arrived.

Nonetheless, Brinton -- who says her formula for sales is to look people in the eye so they will feel guilty if they do not buy -- has had her share of acclaim. Last winter, she sold cookies to President Reagan, Vice President Bush and several Cabinet members. Last week, she was presented a declaration from the Virginia General Assembly officially recognizing her as the nation's leading cookie seller.

On the heels of this honor, Brinton announced that although she will continue to sell Girl Scout cookies, her days of breaking records will end with this selling season. Racial Policy Explained

A private recreation center in Lively, Va., that refused to admit a black teen-ager to its swimming pool last summer has adopted resolutions making clear that its policy is to accept members and guests without regard to their race.

An Arlington County resident, Jan Anderson, threatened to sue the center last summer after her 13-year-old baby sitter, who is black, was kept out of the pool.

The center's attorney, James C. Breeden, said its members adopted resolutions last month stating that admittance of members and guests would not be based on race, color or creed. Breeden said this had been the club's policy all along and that the recent resolutions only reconfirmed that.

"The center has never had a discriminatory policy," he said.

Anderson said last week that although she had retained Alexandria attorney Victor Glasberg, "we had not started litigation . . . . It was settled out of court."

The baby sitter -- whom Anderson said wanted to be identified only by her first name, Beverly -- had traveled with Anderson to the small community on Virginia's Northern Neck to visit friends. When they attempted to swim at the center, an employe stopped them, saying, "We don't allow blacks in our pool," according to Anderson.

"I just wish it had never happened," Anderson said.

Breeden said last summer's incident was an isolated one and that the employe was "put on notice" that he had acted improperly. The Pterosaur's Hang-Up

Despite its very public and very humiliating beak-first dive at Andrews Air Force Base May 17, the mechanical pterosaur with the $700,000 price tag has been given a place of honor at the Smithsonian's Air and Space Museum.

The replica of the flying lizard, which last soared the planet 65 million years ago, is the newest and, for now, most popular exhibit at the museum, where it went on display a week ago. The gawky-looking model has a starring role in the museum's new big-screen film, "On the Wing," which premieres June 20.

The contraption, with an 18-foot wingspan that is half the size of the original creature, crashed 45 seconds into its first and only public flight. It was decapitated on impact, but that problem and other broken parts were quickly repaired. The tailless pterosaur has been hung from the museum ceiling, which is probably the best means yet of keeping it aloft.