太阳的质量占整个太阳系的( )A．99% B．99.9% C．99.8% D．99

请仔细阅读小题，从A、B、C、D中找出其相对应的礼仪规则, 并回答第5小题。
小题1:The first and greatest rule. Talking is not allowed, even including talking quietly during the music.
小题2:The musicians do not need your help, and your neighbors need silence. Learn to tap (轻敲) your fingers quietly on the chair - it’s a good finger exercise.
小题3:Drinks and candies are not allowed.
小题4:Remember that you are representing your school, and you want to be on your best behavior. There are many eyes looking at you.

A. Do not embarrass your teacher nor your school B. No singing, tapping fingers or feet C. Please have nothing in your mouth, besides your teeth and tongue D. Do not talk

小题5:What’s the best title for this material?

A．The Rules of Concert Etiquette	B．The Rules of Hotel Etiquette
C．The Rules of Bank Etiquette	D．The Rules of Airport Etiquette