Is there a strange something high up in the world's tallest mountains? If so, is it a big bear? Is it a monkey? Or is it a kind of man? No one knows. This mystery has puzzled the world for years. In 1887, a mountain climber found large footprints in the snow. They looked like the footprints of a very large man. But men don't walk without shoes in the snow! In 1906, other climbers saw more than footprints. Far away they saw a very large animal standing on two legs. As they watched, it ran very quickly. Fifteen years later, newspapers, had new stories about the "something". A mountain climber said he had seen the "snow man" walk slowly across the snow, far below him. He said it looked like a very large man. From then on, more and more people had stories to tell. But not until 1951 did a mountain climber bring back pictures of large footprints. His pictures showed clearly that the snowman walked on two legs, so it was not a bear or a monkey. Could it be an ape man? The mystery grew! And the mystery keeps growing. Some day we may find out just what it is that makes the large footprints. The passage is about   _  .
some mountain climbers some strange animals some large footprints the mystery of the snowman
Question: Is there a strange something high up in the world's tallest mountains? If so, is it a big bear? Is it a monkey? Or is it a kind of man? No one knows. This mystery has puzzled the world for years. In 1887, a mountain climber found large footprints in the snow. They looked like the footprints of a very large man. But men don't walk without shoes in the snow! In 1906, other climbers saw more than footprints. Far away they saw a very large animal standing on two legs. As they watched, it ran very quickly. Fifteen years later, newspapers, had new stories about the "something". A mountain climber said he had seen the "snow man" walk slowly across the snow, far below him. He said it looked like a very large man. From then on, more and more people had stories to tell. But not until 1951 did a mountain climber bring back pictures of large footprints. His pictures showed clearly that the snowman walked on two legs, so it was not a bear or a monkey. Could it be an ape man? The mystery grew! And the mystery keeps growing. Some day we may find out just what it is that makes the large footprints. The passage is about   _  .
A. some mountain climbers
B. some strange animals
C. some large footprints
D. the mystery of the snowman
Answer: