【正确答案】
B
【答案解析】[听力原文]14-15
When you were six years old, you had 20 teeth in all. These are called milk teeth. After you are six, your milk teeth begin to fall out. They are making way for a new set. As a new tooth comes out, it cuts off the food supply to the milk tooth. After a while, the milk teeth fall out. By the time you are 25 ,you should have a whole new set of teeth. And you'll have 12 extra teeth. In all, you'll have 16 teeth in each jaw. These teeth will stay in your mouth forever unless they are not well protected.
14. How many is a full set of milk teeth?