后牙接触前牙不接触需调整哪个因素
A．前牙覆盖
B．降低胎平面
C．横骀曲线
D．都需要
E．前牙覆牙合
参考答案：E
什么叫吸附剂？
用适当的情态动词填空。
1. _____ you like to share a room with
your sister?
2. Mum said to her baby" You _______ not eat so many candies. "
3. — You have so much work to do. _____.
— you like me to help you?
— No, thanks.
4. — ______ I finish the job tomorrow?
— No, you needn't.
5. — Could I use your computer?
— Yes, you _____.
6. — Need I go there with you?
