题目

设是定义在上的偶函数，则的值域是（      ） (A)      (B)     (C)     (D)与有关，不能确定 答案：A 【解析】试题分析：函数的定义域关于原点对称是函数成为奇偶函数的必要条件，所以1+a=-2，a=-3． 考点：函数的奇偶性．根据中文和首字母提示补全单词。注意：每空仅填写一个单词。【1】Located in the heart of Beijing, the Forbidden City is a popular tourist d_________. （目的地）【2】I couldn’t have realized my dream without my parents’ unwavering faith and e_________. （鼓励）【3】To the teacher’s surprise, many students v_________ to repaint the wall after school. （自愿）【4】He was r__________ from his heart attack. （恢复）【5】The long walk has given me a good a ____________ for dinner. （胃口）【6】All the visitors admired the painting, nodding their a __________. （赞赏）【7】The school aims to prepare students to make c___________ to society. （贡献）【8】Albert had a heated a _______ with his father about whether to sell Joey. （争吵，争论）【9】When we are with children, it is important to achieve the right balance between love and d _________. （纪律）【10】After the war, a m _________ was built to remember those who devoted their lives. （纪念碑）