【正文】
. 他的房間是三個中最干凈的一個 . 上海是中國最大的城市 . The girl with red hair is the tallest in our class. Today is the hottest day of the year. His room is the cleanest of the three. Shanghai is the largest in China. More examples: He is the youngest of all the children. This book is the most interesting of all books. America is the most developed country in the world. The Changjiang River is the longest river in China. He is one of the greatest scientists in China. The city is one of the most beautiful cities in the world. Lucy is one of the tallest girls in her class. Give my best wishes to you. He is my best friend.