下列实验现象的描述正确的是（ ） A．木碳在氧气中燃烧产生明亮的黄色火焰 B．磷

     He has been called the "missing link." Half-man,half-beast. He is supposed to live in the highest mountain in
 the world-Mount Everest.
     He is known as the Abominable Snowman.The   1   of the Snowman has been around for   2  . Climbers
in the 1920s reported finding marks like those of human feet high up on the side of Mount Everest.The native
people said they   3   this creature and called it the "Yeti," and they said that they had   4   caught Yetis on two
occasions   5    none has ever been produced as evidence (证据).
     Over the years, the story of the Yetis has   6  . In 1951, Eric Shipton took photographs of a set of tracks
in the snow of Everest.Shipton believed that they were not   7   the tracks of a monkey or bear and   8   that
the Abominable Snowman might really   9  .
     Further efforts have been made to find out about Yetis. But the only things people have ever found were 
 10  footprints. Most believe the footprints are nothing more than  11  animal tracks, which had been made  12  
as they melted (融化) and refroze in the snow.   13  , in 1964, a Russian scientist said that the Abominable
Snowman was  14  and was a remaining link with the prehistoric humans. But,   15  , no evidence has ever  16  
been produced.
     These days, only a few people continue to take the story of the Abominable Snowman  17 . But if they ever 
 18  catching one, they may face a real  19 :Would they put it in a  20  or give it a room in a hotel?