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3.[音频]听录音回答3-5题

A. To have better opportunities.
B. To improve his skills.
C. To work fewer hours.
D. To get a higher salary.

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4

A. For six years.
B. For five years.
C. For three years
D. For two years.

5

A professor.
B. A manager.
C. An engineer.
D. A designer.

下列哪种物质不是化工原料的“三苯”？（）

A. 苯
B. 甲苯
C. 乙苯
D. 二甲苯

化工生产中的“三烯”不包括( )。

A. 乙烯
B. 丙烯
C. 丁烯
D. 丁二烯