题目

Many years ago, there was an old man who had four sons. He wanted his sons to learn not to judge (判断) things too ______, so he told them to go and look at a pear tree. It was far away from his home. The first son went in winter, the second in spring, the third in summer, and the youngest son in autumn.When the sons came back, the old man asked them to tell him ______ they had seen. The first son complained the tree was ______. The second son said, “No, it was ______with buds (花蕾) and full of hope”. The third son disagreed. He said the tree was full of green leaves. They looked so _The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet. A．why; thatB．why; becauseC．that; thatD．for; that