短文改错(共10小题；每小题1分，满分10分)

One day, there is a blind man sitting with a sign by his feet, that read, “I am blind, please help. ” A creative publicist was walking by him and observed that the man only had a few of

coins in his hat. He put a few of his own coin in it. Without ask for permission, he took the sign, turned it around, and wrote a new message. He then placed it back and left. Later that afternoon publicist returned and noticed that the hat was almost complete full of coins. The blind man recognized his footsteps and asked if it was she that had changed the sign. He wanted to know which the publicist wrote on the sign. The publicist replied, “I just changed your message because people could understand it. ”He said goodbye and went on his way. The blind man didn’t know the new sign was “Today is spring but I cannot see it”.

一根长3米的绳子系着一只羊，栓在草地中央的树桩上，羊吃草的面积最多是多少平方米？