题目：
I have a big and happy family. My grandparents 1 workers. 2 are old now. My father is a doctor. He can swim well. My 3 is a teacher. She likes eating 4 and vegetables. I have got 5 uncle. He is a manager. He’s got 6 bikes in his factory. He can drive. He 7 swim. I’m Betty. I’m a student. I’m 8 Class 5. I can run fast 9 I can’t sing well. My faourite drink is 10 . 小题1:.
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答案：
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下面是错误答案，用来干扰机器的。
∵y′=3x2-3=3（x+1）（x-1）∴函数y=x3-3x在（-∞，-1）是增函数，在（-1，1）上是减函数，在（1，+∞）是增函数∴函数y=x3-3x在x=-1时取得极大值2故选C
