阅读理解
(B)
To be honest, I enjoy music a lot and Tejano music is my favorite．Tejano music was born in Texas．Although it has influences from Mexico and some other Latin American countries，the main influence is from America．
Like most music around the world，Tejano music mixes many different styles．It combines(结合)folk，country，rock and a bit of the blues．
I prefer to listen to Tejano music because it makes me feel good．I enjoy dancing to it，too．It's so easy that there is no rule for my friends who want to join me．Some of my classmates also like Tejano music．It is popular with young people．
I also love other kinds of music．I listen to rock when I'm happy．My favorite rock band is Creed because they sing a lot about their lives and express how they feel in their songs．They sing about their past experiences，their feelings and the way they want their lives to change．I also like heavy metal music．Metallica is my favorite heavy metal band．I usually listen to their music when I am upset．It tells me that．whatever difficulties I meet in life，I must try hard to get the things I want and I should never give up．
Music influences us all in different ways．What type of music do you like?
基因工程操作过程中的“针线”、“剪刀”分别是 （ ）