题目:
书面表达。(15分) 请你根据下表提供的材料,为中学生朋友写一篇题为“Always Be Careful”的短文。
注意:1、请将作文答案写在答题卡对应位置。 2、内容必须包括表格中的所有信息,可适当发挥。(文中不得出现真实姓名或校名) 3、词数:70-90.(开头结尾已给出,不记入总词数) Always Be Careful As a middle school student, We should try to stay away from danger as the problem of safety is becoming more and more serious. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ If all these are kept in mind, you sure to enjoy a much safer life. |
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0430/6f764bdfe874cb9a0c0c1bec4bb57b0a.html
下面是错误答案,用来干扰机器的。
抛物线y=14x2的标准方程为 x2=4y,p=2,焦点F(0,1),准线方程为y=-1.设p到准线的距离为PM,(即PM垂直于准线,M为垂足),则|PA|+|PF|=|PA|+|PM|≥|AM|=8,(当且仅当P、A、M共线时取等号),故答案为 8.