2. 外语
  3. When you were six years old, you had 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to【11】. The

When you were six years old, you had 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to【11】. The

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问题     When you were six years old, you had 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to【11】. They’re making way for a new【12】. As new teeth comein, they cut off the【13】supply to the milk-teeth. 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【14】teeth. In all, you’ll have【15】teeth in each jaw.  
  
When you are six years old, you have 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to fall out. They’re making way for a new set. As new teeth come in, they cut off the full supply to the milk-teeth. 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．
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