选词填空。
严峻   严格   严肃   严厉
老师____地说：“时光不等人职，你们要时刻____要求自己，今后才能经受住各种____的考验。”

你喜欢面条。你说：

阅读短文，选择正确的答案。
    Tom went to Beijing by plane on his holiday. Every day he had fun with his parents. They went boating. They saw some elephants. They went swimming. They ate lots of delicious food. They also took many beautiful pictures. They will come back tomorrow. He enjoys his holiday.

读我国某区域1月份等温线分布图和1月份某日某种天气系统等压线形势图，完成下面小题。

“国体同则政体同，国体异则政体异。”这一说法（ ）