问题
单项选择题 A1/A2型题
如下颌双侧第二乳磨牙拔除后，其缺隙保持器不宜选择（）
A.舌弓保持器
B.活动保持器
C.丝圈式保持器
D.托牙保持器
E.固定桥保持器
答案
参考答案：E
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如下颌双侧第二乳磨牙拔除后，其缺隙保持器不宜选择（）
A.舌弓保持器
B.活动保持器
C.丝圈式保持器
D.托牙保持器
E.固定桥保持器
参考答案：E
| 完形填空。 | |||
| People and animals live in the same world. We should keep the balance 1 people and animals. If the balance destroyed, there 2 bad results to both people and animals.Wild animals are 3 of people. We 4 protect them, or there will be no wild animals in the future. There is a black and white animal 5 in China.It is always known as the national treasure (国宝)of China. Everyone knows it is 6 Giant panda. Now there are 7 pandas than before. 8 of them live in Sichuan and Gansu Provinces. There are also some other rare animals in China. However, the number 9 smaller and smaller than before. So people should help these animals. They are 10 disappearing from the world. | |||
| ( )1. A. between ( )2. A. could be ( )3. A.friend ( )4. A. has to ( )5. A. lives ( )6. A. call ( )7. A. few ( )8. A. Most ( )9. A. is become ( )10. A. in dangerous | B. among B. is B. enemy B. must B. lived B. name B. less B. Many B. is becoming B. in danger | C. in C. will be C. enemies C. needs to C. living C. calling C. fewest C. More C. become C. in danger of | D. along D. may be D. friends D. have D. to live D. called D. more D. The most D. become D. out of danger |