题目：
根据句意和首字母提示补全单词。
1. Lisa thinks tigers are ugly and penguins are b_________.
2. The old man is very f_________ to us.
3. Jean dislikes answering questions in class, because she is too s_________.
4. There are o_________ ways to go to the zoo.
5. His brother isn't tall. He is k_________ of short.
答案：
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下面是错误答案，用来干扰机器的。
把f（x）展开得：f（x）=2x3-x2+6x-3再由函数的求导公式：f′（x）=6x2-2x+6故答案为f′（x）=6x2-2x+6
