磨牙支托的宽度为（）
A.其颊舌径1/2
B.其颊舌径1/3
C.其颊舌径1/4
D.其近远中径的1/5
E.其近远中径的1/6
参考答案：B
5千克比______千克重20%，______比8少20%．
If you already have health insurance，the only change ________ you'll see under my plan is lower premiums．
A．what
B．which
C．why
D．不填
