题目：
| 完形填空。 | ||||
| Lucy and I are in the same class. She's a 1 student and is always the best in the class in her studies. She often goes to school by bike because her home is a little 2 from the school. She 3 beside me in the classroom. Lucy likes 4 very much and often take exercises after school. She often helps me with my studies and I 5 her very much. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
显然f（1）是最大值，所以f（1）=cos（2+φ）=1，∴2+φ=2kπ，φ=2kπ-2，k∈Z，所以f（x）=cos（2x+2kπ-2）=cos（2x-2）∴f（x+1）=cos（2x+2-2）=cos2x所以f（x+1）是偶函数．故选A．
