阅读短文，判断句子正（正确）误（错误）。

    Tom is my classmate. He is from London in England. But he likes China very much. Now he is in Beijing. He is a little fat. He has a round face and big blue eyes. His hair is not black but yellow. His nose, mouth and ears are big. He likes blue. He likes wearing a blue T-shirt and blue jeans. Look at his hand. He has a football in it. We often play football after class.

下列离子中最易给出电子的是（　　）

群落中植物的垂直结构为动物创造了多种多样的____ ，因此，动物也有分层现象．