12．One day，a raven（渡鴉）happened to fly past a lake．Looking at the lake，he saw the most beautiful animal he had ever seen．It was a swan（天鵝）and its feathers（羽毛）were as white as snow．The swan was playing with other birds happily，talking and dancing．And it seemed that the other birds all liked to stay with it．When he looked at his own feathers，they were as black as coal．The raven was very angry with the swan．"How can the swan have such wonderful feathers？"said the raven．What should he do with his feathers？He thought it over and over．
Then，the raven decided that he also wanted to have white feathers like the swan's．From that day on，the raven began to live like the swan．He moved his home from the woods to the lake．He also started to eat water plants like the swan．He tried his best to talk and dance with the other birds．The most important was that each day，the raven would wash his feathers，hoping that they would turn white．Even he went to the nearby rivers and ponds to wash his feathers because he thought the water in the lakes was not enough for him to wash them．But no matter how hard he washed his feathers，they remained black．
As he ate only water plants，he soon grew thinner and thinner．Not many days later，the raven died．
51．The underlined word"it"in Paragraph 1refers toB．
A．the raven
B．the swan
C．the feather
D．the water
52．Why was the raven angry with the swan？C
A．His own feathers were as white as snow．
B．The swan did not have black feathers like him
C．The swan had beautiful white feathers
D．The swan lived in the lake with other birds
53．Where was the raven's natural home？C
A．The lakes
B．The ponds
C．The woods
D．The rivers
54．Why did the raven want to live like the swan？D
A．He wanted to make friends with the swan
B．He wanted to see the swan's whitefeathers
C．He wanted to eat water plants
D．He wanted to become a swan
55．Why did the raven wash his feathers every day？A
A．He thought his feathers would turn white．
B．He wanted to drive the other birds away
C．He thought his feathers were dirty．
D．He wanted to keep his weathers white．
