问题
选择题
There are usually 28 in a person’s mouth, so we should listen to the doctor’s ______ to protect（保护）them.
A．tooth, advice
B．teeth, advice
C．toothes, advices
D．teethes, advices
答案
答案：B
本题中的牙齿为可数名词，复数为teeth，advice为不可数名词，故本题选B。