What is a good heart made of

What is a good heart made of 求英语作文《what is a good heart》?120字左右.... what do you think is a good heart what is this kind of coat made of it is made of () A cotton What is made of alveoli What is it made of? what is it made of what is CD made of? What do you think is a good heart?What do you learn from the Heart is made of--- A) Tissue B) Blood C) Muscle D) Veins 英语 请问what a thing is the heart of man heart为什么是单数呢? What is the lift made of?---It's made of____. A.plastic B.pa