A group of swans flew down to a beach where a crow（乌鸦） was jumping around．The crow watched them with disdain（鄙视）．
"You have no flying skills at all!"he said to the swans．"All you can do is to move your wings．Can you turn over in the air？No，that's beyond you．Let's have a flying competition．I'll s
how you what real flying is!"
One of the swans，a strong young male，took up the challenge．The crow flew up and began to show his skills．He flew in circles，performed other flying tricks，and then came down and looked proudly at the swan．
Now it was the swan's turn．He flew up，and began flying over the sea．The crow flew after him，making all kinds of comments（评价） about his flying．They flew on and on till they couldn't see the land and there was nothing but water on all sides．The crow was making fewer and fewer comments．He was now so exhausted that he found it hard to stay in the air，and had to struggle to keep himself from falling into the water．
The swan pretended not to notice，and said，"Why do you keep touching the water，brother？Is that another trick？"
"No，"said the crow．He knew he had lost the competition．"I'm in trouble because of my pride!If you don't help me，I'll lose my life…"
The swan took pity on him，and took him on his shoulders and flew back to the beach．

51．What's the correct order of the following events？
a．The crow showed off its flying skills．
b．The swan felt pity for the crow and saved it．
c．The crow laughed at the swan's flying．
d．The crow followed the swan and got into trouble．
e．The crow challenged the swans and a strong young swan accepted it．
A．e，c，d，a，b
B．a，e，c，d，b
C．c，e，a，d，b
D．e，a，d，c，b
52．What does the underlined word"exhausted"in Paragraph 4mean？
A．Tired．
B．Angry．
C．Frightened．
D．Regretful．
53．Why did the crow keep touching the water？
A．It was showing another flying skill．
B．It was struggling to keep itself from falling into the water．
C．It was thirsty and wanted to drink some water．
D．It was enjoying itself by doing so．
54．What can we infer（推断） from the passage？
A．The crow didn't know flying．
B．Flying skills were useless．
C．The swan saved the crow because they were good friends．
D．The swan was better at long-distance flying than the crow．
55．What does the story tell us？
A．Pride goes before a fall
B．The early bird catches the worm．
C．No pains，no gains．
D．Practice makes perfect．