题目内容：

    China’s artistic swimming duo (双人表演) Ms Jiang and her twin sister made history on Tuesday by gaining a sixth gold at the Asian Games, the most earned by any athletes in artistic swimming in its history. What makes the twin sisters’ achievement more remarkable is the fact that both of them returned from giving birth to baby daughters to do so.

"I’ve been their coach for over 20 years," said Ms Zheng. Women’s Duet coach, "ever since they were 8 years old. When they came back after having babies, their training plans were completely changed. I think they have already showed that female athletes can return to their best form after having a baby. "

The twin sisters announced their retirement after finishing a third at the 2013 China National Games. They went on to get married on the same day and their baby daughters arrived in 2015 and 2016. And after a three-year absence, the twins decided to come back to the pool.

"I think to reach a mature state in artistic swimming, athletes have to go through years of training. What keeps us going is our love of the sport," said one of them.

The 31-year-old twins won a well-deserved gold at the 2017 China National Games. At the third Asian Games, they claimed their sixth gold at the multi-sports meet to be a record in artistic swimming at the Games, and a result their coach wasn’t sure could happen when they first decided to come back.

"Because of our love of the sport, we overcame many hard times, especially the physical obstacles. After all, we’re no longer young. But now I think we are even better than before," said the other.

To be a mother while training and competing at the highest level means this gold medal seems much more than any of the others from before.

1.Why was the twins' achievement regarded to be extraordinary?

A.They won six gold medals at the Asian Games.

B.They got trained by plans that were totally different.

C.They got the most medals in artistic swimming in history.

D.They returned from giving birth to baby daughters to do so.

2.What was their coach's attitude to their winning when they first decided to come back?

A.Skeptical. B.Determined.

C.Confident. D.Unclear.

3.What does the twins' victory tell us?

A.Practice makes perfect. B.Failure is the mother of success.

C.Knowledge comes from practice. D.Nothing is too hard for a determined mind.

4.Where does the text probably come from?

A.A sports textbook. B.A research paper.

C.A news report. D.A sports brochure.