What is made of alveoli

What is made of alveoli What is it made of? what is it made of what is CD made of? What is telephone made of?的意思 What is the sun made up of? Time is what you made of What is a good heart made of What is your shoes made of 如何 回答what is it made of what is this kind of coat made of it is made of () A cotton What is the House of Lords made up of?