谣谶是带有一定目的性、被当做预言来传唱的歌谣。后周时，有人制造“点检作天子”的谣谶，周世宗为绝后患，撤掉殿前都点检张永德，以赵匡胤代之。后来赵匡胤推翻后周，建立宋朝。这说明谣谶 （ ）
Take a look at the following ads! You may find some useful information you need here!
Guitar lessons
Experienced(有经验的) musician(音乐家) from Australia. Good at teaching kids for 5 years!
For more information, please visit Larry's website: www.music.com.
Taxi driver wanted
Full time or part time. Experience and a good knowledge(知识) of the city are necessary(必要). English is also a must.
Under 45 years old.
Call Mr. White at 5132683.
Apartment(公寓) for sale
Two bedrooms, a kitchen and a bathroom.
Hot water 8:00-18:00.
Beautiful sights out of the windows.
E-mail: sdgt@yahoo.cn.
人类使用材料的增多和变化，标志着人类文明的进步，下列材料与化学制备无关的是（ ）
