颈侧1/3折断，折断线在龈下1～4mm时，可采用（）
A.降低咬合
B.正畸牵引术
C.药物脱敏
D.覆盖义齿修复
E.夹板固定
参考答案：B
---Which sport do you like better, swimming or playing basketball?
---I prefer ______ to _______. I don’t like water sports.
A. swimming, playing basketball
B. swim, play basketball
C. playing basketball, swimming
一架执行国际航班的涡喷飞机在中国境内飞行时，当到达最远的备降场以后，机上最少燃油量是多少？
