听力原文: When men first lived on the earth a long time ago, they had no proper place to live in. In order to get away from the heat of the sun, to keep themselves warm and dry, they found caves. Caves really gave them some kind of help. Some of these early men built their shelters up in the tree to escape wild animals. They had a hard life and had to go about from place to place for food. Much later on, their lives began to change. They learnt how to keep animals in herds. As they had to move their herds of animals from place to place for grassland, they had to build shelters which were easily carried about.
When they finally learnt the art of farming, they had to clean forests and started planting crops. After that, they had to think about building more permanent shelters. Old houses were built at first with wood and they even use grass as roofs. This went on for a long time. They kept making their houses better. Today, houses of all kinds are built. They are strong, permanent and can last a very long time.
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A.To get away from the heat of the sun.
B.To keep themselves warm.
C.To get away from the rain.
D.To keep themselves dry.
第1题
牙体缺损修复时牙体制备如切磨过多接近牙髓修复后可出现()。
A.过敏性痛
B.自发性痛
C.龈炎
D.咬合痛
E.修复体松动
第2题
牙体缺损修复时,牙体制备如削磨过多接近牙髓,修复后可出现
A.过敏性痛
B.自发性痛
C.咬合痛
D.龈炎
E.修复体松动
第4题
牙体缺损修复时如修复体不吻合或粘固剂质量差修复后可出现
A.过敏性痛
B.自发性痛
C.咬合痛
D.龈炎
E.修复体松动
第5题
A.过敏性痛
B. 自发性痛
C. 咬合痛
D. 龈炎
E. 修复体松动
第6题
牙体缺损修复时如修复体不吻合或粘固剂质量差修复后可出现()。
A.过敏性痛
B.自发性痛
C.龈炎
D.咬合痛
E.修复体松动
第7题
牙体缺损修复时如粘固剂过稀会引起
A.过敏性痛
B.自发性痛
C.咬合痛
D.龈炎
E.修复体松动
第8题
牙体缺损修复时如原有根尖周病未彻底治疗修复后会出现()。
A.自发性痛
B.过敏性痛
C.咬合痛
D.龈炎
E.修复体松动
第9题
牙体缺损修复时如原有根尖周病未彻底治疗,修复后会出现
A.过敏性痛
B.自发性痛
C.咬合痛
D.龈炎
E.修复体松动
第10题
牙体缺损修复时如未排除早接触,术后可出现
A.过敏性痛
B.自发性痛
C.咬合痛
D.龈炎
E.修复体松动
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