题目

10℃时，分别向4支小试管中滴加8滴1mol/LCuSO4溶液，再分别向其中滴加2mol/LNaOH溶液，边滴加边振荡，实验数据及现象如下表： 试管编号1234 滴加NaOH溶液的量2滴6滴12滴16滴 立即观察沉淀的颜色浅绿色浅绿色蓝色蓝色 酒精灯加热浊液后沉淀的颜色浅绿色浅绿色黑色黑色 取浅绿色沉淀用蒸馏水反复洗涤，加入稀盐酸完全溶解，再加入适量BaCl2溶液，产生大量白色沉淀。取蓝色沉淀重复上述实验，无白色沉淀。经检验，试管3、4中黑色沉淀中含有CuO。 下列说Good morning. The program today is about music. The word "music" comes from the Greek word "muse". The Muses are the goddesses of the arts. Music is only one of the arts. It is like the spoken language,but it uses sounds. Today's program brings together music from different corners of the world. Who invented music? Who sang the first song? No one knows exactly the answers to these questions. But we know that music plays an important part in almost everyone's life. Babies and young children love to hear people singing to them. When they are a little older,they like to sing the songs they have heard. When children go to school,their world of music grows. In the middle grades,students take music lessons. When they reach high school,they become interested in listening to pop music.The records we have chosen for you today are from American country music,Indian music,pop music and so on. Music has meaning for everyone. It can make people happy,or it can make them sad. In this program,we shall study the language of music. We shall be trying to find out more about how music works. We shall try to find out how music says what people feel.(   ) 11. The first paragraph is mainly about the         .   A. styles of music   B. history of music   C. taste of music   D. knowledge of music(   ) 12. The speaker is probably         .   A. a host   B. a singer   C. a dancer   D. a teacher(   ) 13. Which is true according to the passage?   A. The Muses invented music.   B. Music can bring people some feeling.   C. Music was from a Greek village.   D. Everyone is interested in pop music.(   ) 14. The speaker believes that         .   E. music is a spoken language   F. music develops as we grow up   G. music is above the other arts   H. music plays an important part in our life(   ) 15. What is NOT the purpose (目的) of this music program?   A. To study the language of music.   B. To learn more about the music.   C. To give a complete background to the music.   D. To give people some music to listen to.