精选训练：2015年6月大学英语六级语法练习（5）

　　29. The director gave me his ________ that he would double my pay if I did my job well.

　　A) warrant

　　B) obligation

　　C) assurance

　　D) certainty

　　30. The Christmas tree was decorated with shining ________ such as colored lights and glass balls.

　　A) ornaments

　　B) luxuries

　　C) exhibits

　　D) complements

　　31. The two most important ________ in making a cake are flour and sugar .

　　A) elements

　　B) components

　　C) ingredients

　　D) constituents

　　32. Cultural ________ indicates that human beings hand their languages down from one generation to another.

　　A) translation

　　B) transition

　　C) transmission

　　D) transaction

　　33. We must look beyond ________ and assumptions and try to discover what is missing.

　　A) justifications

　　B) illusions

　　C) manifestations

　　D) specifications

　　34. No one imagined that the apparently ________ businessman was really a criminal.

　　A) respective

　　B) respectable

　　C) respectful

　　D) realistic

　　35. If nothing is done to protect the environment, millions of spedes that are alive today will have become ________ .

　　A) deteriorated

　　B) degenerated

　　C) suppressed

　　D) extinct