问题
单项选择题
某二叉树共有7个结点，其中叶子结点只有1个，则该二叉树的深度为(假设根结点在第1层)？（）
A．3
B．4
C．6
D．7
答案
参考答案：D
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某二叉树共有7个结点，其中叶子结点只有1个，则该二叉树的深度为(假设根结点在第1层)？（）
A．3
B．4
C．6
D．7
参考答案：D
| 完形填空。 | ||||
| There is a zoo in our city. My parents often take me there __1__ Sunday. I like animals. I have a lot of __2__ animals in my room. In the zoo I can see tigers, elephants, monkeys, pandas, bears, snakes __3__ many other animals. I think the most interesting animal in the zoo is the __4__. I like watching them swim and jump. They swim fast and they jump very __5__. They can play with a __6__. They can stand up on water! They are very __7__ to people. If you __8__ into the water and __9__ swim, they may come up to __10__ you. | ||||
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