问题
单项选择题 A1型题
在可摘局部义齿的设计中，为防止义齿下沉，刺激牙龈组织，不宜单独使用 （）
A.间隙卡环
B.环形卡环
C.三臂卡环
D.对半卡环
E.双臂卡环
答案
参考答案：E
解析：间隙卡环有越牙合部，环形卡环、三臂卡环、对半卡环可有牙合支托，对抗义齿下沉。双臂卡环无牙合支托。
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在可摘局部义齿的设计中，为防止义齿下沉，刺激牙龈组织，不宜单独使用 （）
A.间隙卡环
B.环形卡环
C.三臂卡环
D.对半卡环
E.双臂卡环
参考答案：E
解析：间隙卡环有越牙合部，环形卡环、三臂卡环、对半卡环可有牙合支托，对抗义齿下沉。双臂卡环无牙合支托。
| 阅读理解。 | |
| Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. 1______ There was a group of schoolgirls. Their teacher was trying to keep them in line. Tom looked around but there was no place for him to sit. He walked into the station café. He looked up at the clock there. It was only twenty to twelve. 2______ Just then, Mike, one of Tom's workmates came in and sat with Tom. "What time is your bus?" asked Mike. "There's plenty of time yet," answered Tom. 3_________ They talked while drinking. Then Tom looked at the clock again."Oh! It's going backward (倒行)!" he cried."A few minutes ago it was twenty to twelve and now it's half past eleven. 4______ Tom was so sad. The next bus was not to leave for another hour. Since then Tom has never liked mirrors. | |
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| 5. Which of the following is TRUE? | |
| A. Tom arrived in Paris on time B. The next bus would leave in half an hour C. After that Tom didn't like mirrors any longer D. Tom looked at the clock in the mirror only once |