根间组纤维 A．纤维起于牙槽嵴顶，呈放射状向牙冠方向走行，止于牙颈部的牙骨质 B．自

     In a New York street a small truck hit a big tree. The truck was full of glasses and they were    1    now.
The driver came out of the truck and looked at the broken glasses. He was very     2   . And people in the
street were    3    for him. 　　
     Then an old man walked to the driver, looked at him for a few    4    and said, "My poor boy, I think you
must    5   a lot for it." 　　
     "Yes," was the sad answer. 　　
     "Well, well," said the old man, "hold out your     6   . Here's some money for you, and I hope all the people
around here will give    7   , too." With these words, he walked away. 　　
     The driver held out his hat and over a hundred people came and put their money in it. At last the
driver    8    a bag and put all the    9    in, Then he looked at the people and said, "Well, thank you very much. I'm working for that old man, all these   10   are made in his factory."