已知函数的定义域为，若其值域也为，则称区间为的保值区
间．若的保值区间是 ，则的值为

填上＞、＜或=．

天气状况深刻影响着我们的生活．下列天气符号所示天气与人类活动表述合适的是（  ）

根据短文内容理解，选择正确答案。    Hi, I'm Brian. This is the photo of my family. My grandfather is with glasses. He has little hair. The one standing next to him is my uncle. He is wearing a cap. My grandmother has gray hair. She is a kind woman. She is holding my younger brother. He has short curly hair. The woman standing behind me is my mom. She has straight brown hair. There is a little girl sitting on the table. Her name is Cathy. She is my sister. She is wearing a green T-shirt and a pair of green socks. It's her favorite color. Which one is my father? Well, he is wearing glasses, too. He is in brown shorts and brown shoes. His name is Sam. Now, do you know where he is?

People usually ________ at night, but Mr. Wang ________ in the day.