阅读理解并判断句子的正误。

    I have a cousin. He is only four years old. Today I go to a library with him. He doesn't know the signs. I tell him about the signs. This sign means "Be quiet". We should not shout in the library. That sign means "No eating or drinking". We can't eat or drink here. My cousin knows a lot about the signs in the signs in the library after I tell him.