全口义齿后牙选用无尖牙的优点不包括（）
A.侧向力小
B.有利于义齿的稳定
C.容易达到平衡合
D.对牙槽嵴损害小
E.咀嚼效率低
参考答案：E
小明把算式6×（□+4）错写成6×□+4，现在答案和正确答案比，相差______．
— Would you like me to help you carry the heavy bag?
— ________ . It’s kind of you. But I can do it myself.
A．Yes, please
B．No, thanks
C．Sure
D．Yes, I’d love to
