下图为“北半球中纬度某地某日5次观测到的近地面气温垂直分布示意图”。当日天气晴朗，日出时间为5时。由图中信息可分析出(　　)

文献纪录片《走近***》中有这样一个情节：在西柏坡的院子里，警卫员给***梳头时拔下一根白发，***打趣地说：“打了三个胜仗，白了一根头发，值得！”这“三个胜仗”是指（    ）

①平津战役   ②辽沈战役    ③淮海战役   ④渡江战役

根据短文内容，选择正确答案。
   It’s Sunday morning．There are many people in the park，some boys  are playing basketball．There are some girls under a big tree．They’re singing and dancing．What are those women doing? They are drinking tea．Look at the woman in a blue coat．Who's she? She’s my mother．She is talking to Lin Feng．Lin Feng is her student．He is a good student．He studies hard．He’s good at all the subjects． And he's friendly to all his teachers and his friends．

函数$y=\frac{1-k}{x}$的图象与直线$y=x$没有交点，那么k的取值范围是____ ．