由a2，2-a，4组成一个集合A，A中含有3个元素，则实数a的取值可以是（ ）

职位分类强调以“事”为中心，最早是在（）国。

PART FOUR  WRITING

Section A

Directions: Read the following passage and complete the diagram by using the information from the passage. Write NO MORE THAN THREE WORDS for each numbered blank.

Frederic Chopin is one of the most romantic figures in musical biography. He was dreamy and tender(温柔的). Chopin was born at a village near Warsaw, in Poland, on the 22^nd of February 1810.

In his early years Chopin showed himself very interested in music. He was only nine when he made his first public appearance. Chopin had been studying with Elsner, the director of Warsaw Conservatoire, for some time when his father thought it would be good for him to have a little tour before settling down to the practice of his profession. Thus a tour was arranged, Berlin was the first place visited where he heard a lot of music. And then came an important visit to “the beautiful musical Vienna.” There he was surrounded with requests to play in public. After Vienna, he visited Prague and Dresden, where he met more musical celebrities.

It was Paris where he decided to perfect his technique that Chopin finally settled in. The performance came off in 1832, and though the audience was small the artistic success was great. Prince Radziwill took him to a party at the Rothsehilds. He was asked to play, and he played so beautifully that he was drowned with praise. Thus was the young Pole（波兰人）launched on his career of popularity in Paris.

Pauter says truly that Chopin never in his life wrote a bar of music that contained an inferior idea. And there was nothing vulgar (粗俗的) about himself. Nobody knew him better than George Sand. She says, “Gentle, sensitive, and very lovely, he united the charm of adolescence with sincerity of a more mature age.”

计算题：焦炉的烟囱高100m，采用焦炉煤气加热，当外界环境不变，废气在烟囱的平均温度由170℃升至300℃时，其产生的烟囱根部吸力将变化多少？（假设其阻力不变），

CVP正常，BP低反应提示（）

A.血容最严重不足

B.血容量轻度不足

C.容量血管过度收缩

D.心输出量低

E.心功能不全或血容量相对过多

贸易术语FOBC代表的是（）。

A.含定金价

B.含佣金价

C.含折扣价

D.含预付款价