问题
单项选择题
双端固定桥受颊舌向力时，有关基牙运动方式的错误说法是（）
A.两基牙受第二类杠杆作用
B.两基牙会产生旋转运动
C.基牙固位力较差一端易引起松动和脱落
D.均衡受力时，支点线位于两基牙根尖1/3与中1/3交界的连线上
E.固位良好时，可能损伤条件较差一端基牙的牙周组织
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
双端固定桥受颊舌向力时，有关基牙运动方式的错误说法是（）
A.两基牙受第二类杠杆作用
B.两基牙会产生旋转运动
C.基牙固位力较差一端易引起松动和脱落
D.均衡受力时，支点线位于两基牙根尖1/3与中1/3交界的连线上
E.固位良好时，可能损伤条件较差一端基牙的牙周组织
参考答案：A
| 完形填空。 | ||||
| As an exchange student, I have been staying in a host family in Beijing for the past five months. The parents are 1 in their mid-30s and the son just turned 5. In exchange for room and board, I teach their son 2 . Like in many of the other Chinese families, he's an only child. And though he has 3 plastic trucks and boxes full of crayons, I don't know 4 he has the time to play. When he's not in the kindergarten, he's taking after-school classes. On the weekends, the boy goes to more classes. He has one day off―Sunday. Compared to his schedule, I feel like my childhood was 5 a waste of time. I learned how to climb trees and draw cartoons. I wasn't learning Chinese at his age. But he and lots of other children are learning English. Both his parents dream that he will have 6 jobs, higher pay, and bigger houses. The boy seems to take no interest 7 learning English. He doesn't need a teacher, but a playmate. He is, 8 , only 5. When I think about my life as a 5-year-old, I know for sure I wasn't half as 9 as he is. In the evening, when his parents 10 him to speak with me in English, he gets 11 . He lies on the floors, hides under the table and climbs on the furniture. When he finally stops 12 , and starts talking, it isn't in English, but it isn't in Chinese, 13 . He speaks in his own language. He 14 not be a very good student, but I'm not a great teacher. I just want to be his big brother 15 can speak in gibberish (胡言乱语) with him and help draw trucks, robots or spiders. | ||||
|