阅读判断。根据短文内容，判断文后小题句子的正或误。

Long long ago, there was a boy who grazed (放牧) sheep on a hill every day. One day, the boy felt a little lonely and wanted to make fun of the farmers working at the foot of the hill. So he climbed up a big stone and shouted, "Wolves are coming! Wolves are coming!

In a minute, the farmers came only to find there were no wolves at all. Seeing the farmers were taken in, the boy laughed and said, I am just joking "Then the farmers shook (摇) their heads and left. A few days later, the farmers heard the boy shout again. So they ran up the hill and found that they were cheated again. Another day, several wolves really came. The boy was frightened and cried out, "Help! Wolves have come!" But this time, no one came.