D

　　(2016·南通二调)

　　Are Baiji Dolphin Extinct?

　　Does the Yangtze River still have baiji ，the graceful，grey dolphin with tiny eyes and a long narrow beak?

　　Since November 6 ，a team of scientists from China, Switzerland, the United Kingdom ，the United States, Germany and

　　Japan have been searching for any sign of the freshwater dolphin on the middle and lower sections of the river. After six

　　weeks，they came back empty­handed.

　　Wang Ding, of the Chinese Academy of Sciences, who is the head of the team, said he has seen a sharp decline in the

　　baiji population over the past few decades. However, he is still unwilling to call the species extinct, and adds, “We will try

　　every effort to save them as long as they are not found to be extinct.”

　　The baiji is shy and nearly blind and is one of the world's oldest dolphin species. It dates back some 20 million years

　　and is found only in the Yangtze. It's listed as one of the 12 most endangered animal species in the world.

　　Around 400 baiji were believed to be living in the Yangtze until the 1980s. A 1997 survey spotted 13. Two years later

　　their number was down to two.

　　The rapid disappearance of this dolphin over the past two decades coincided with (与……同时) the rapid expansion

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