热凝造牙粉树脂与热凝基托树脂的主要区别是下列哪些
A．树脂组成成分
B．填料
C．分子量大小
D．粉粒直径大小
E．机械性能
参考答案：B,D
解析：热固化型造牙材料又称热凝造牙材料。由造牙粉和造牙水组成。其材料组成与热凝基托材料基本相同，仅是聚合物粉粒的直径和所加填料不同。造牙粉为大于120目的聚甲基丙烯酸甲酯均聚粉、共聚粉或与硬质填料复合的硬质造牙粉，再加入适量颜料染色即可。
完形填空 When I was young, I liked to play jokes on people I knew, especially on my parents and friends. One day my mother was 1 and I was playing with my younger brother Tony. Suddenly I ran to my mother and said, “Tony fell from the open window!” She was very 2 and ran out of the kitchen. Then I said, “Don’t worry. I’m just 3 .” And my mother shouted at me, “If you do it 4 , I’ll hit you.” One day I went swimming with my 5 in the sea. I wanted to play a joke on them. In the beginning, I went swimming 6 , and I called out, “Help!” All my friends came to help me, only to 7 that I was joking. But the next time I wasn’t joking. I was so 8 that I swam in deep water. I tried my best to call my friends for help, but this time nobody came to help me. 9 , they found I was telling the truth. They came and saved my life. They took me to the hospital. This is the best 10 in my life. From then on, I haven’t joked on anyone.
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