"Teacher, why can't two children with blood type A have blood type B or blood type AB?"

The nature teacher thought for a moment and said, "You don't need to understand this in detail, I'll learn it again when there is a biology class." "The biggest fear of elementary school teachers is that students ask about biology.

But Hou...

"Wear Black Lotus: Make Trouble, Appointment" Chapter 597 Grumpy Patronus 12 is hitting with his hand, please wait a while,

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