简析下列句中加下划线词语的表达作用。

①她也是一个美丽动人的姑娘。

②最后只得跟教育部的一个小书记结了婚。

③她没有漂亮服装，没有珠宝，什么也没有，然而她偏偏只喜爱这些。

Though many extra planes and trains are used to carry passengers, traffic tools are still ______needed during “May Day” holidays.

 I like cola very much.

“PM2．5”颗粒物是造成天气阴霾的主要原因。其中的“2．5”是表示颗粒直径的数值，关于它的单位，下列选项中正确的是（   ）  

根据短文理解，选择正确答案。
    Bob works in an office. Every morning he has breakfast at seven thirty, reads his newspaper, drinks a cup of coffee and then goes to work. One morning, he is still at the table reading his newspaper at: 8 0'clock. He asks his wife for another cup of coffee. His wife asks him, “Aren't you going to the office today?” “The office?” He jumps up from his chair, "I think I am in the office."