阅读下面短文，按照句子结构的语法性和上下文连贯的要求，从各题所给的A、B、C和D项中选出最佳选项。
A long time ago，some farmers lived in a small village.And there was a farmer1 had four sons.
The farmer raised the four boys on his own.He hoped that his sons could learn not2 opinions about things too quickly.So he gave his four sons 3 question in turn asking them to go to see a pear tree at a distance in different seasons.The sons promised they would not let their father 4.
The first son5 out in the winter，the second in the spring，the third in the summer，and the youngest in the autumn.
One year passed.When all of them returned home，the farmer called them together to describe6they had seen.
The first son said the tree was7bent and distorted.It wasn't worth seeing at all.And it seemed that it wouldn't bear any fruit，8.
The second son said it was not like that. But the tree was covered9 green buds and made people feel full of hope.
The third son disagreed，saying that it was full of flowers which smelled so sweet and 10 so beautiful.And he had never seen such beautiful scene that everyone would love it.
The last son disagreed with all of them，saying that it 11 with fruit，full of life and content.People would be satisfied with it.
At last，the four sons'eyes were fixed12 their father.The father smiled.Then he told his four sons that13 they were all correct，they only saw the tree in one season.He told his sons that14 could not judge a tree or a person only by one season，and that the essence of a person could only be measured when all the seasons 15 over.
If you just give up in winter，you will miss the hope of spring，the beauty of
summer and the harvest of autumn in your life.
