I`m Tony. My best friends are Frank and Cindy. We often do many things together. Frank lives next to my home and we are in the same class. He is thirteen years old and tall and medium build. He has curly hair and blue eyes. He is good-looking and clever. He is good at math and often helps me with my homework. He likes wearing black pants and yellow T-shirts. Cindy doesn`t go to my school. She is eleven years old. She is thin and medium height. She has curly blonde hair and her eyes are brown. She is good-looking, too, but a little bit shy. She is good at playing the guitar. Her facorite subject at school is music. She often teaches Frank and me to play the guitar after class.
The three of us have great fun together, and we help each other and sometimes play video games at my house.
小题1: eyes are blue.
A．Frank’s
B．Cindy’s
C．My
D．Tony’s小题2: good at math .
A．Cindy is
B．Tony is
C．Frank is
D．I am小题3: is good-looking ,but a little bit shy .
A．Frank
B．Cindy
C．Tony
D．My friend小题4:Where do they play video games ?
A．at school
B．at Frank’s house
C．at Cindy’s house
D．at Tony’s house小题5:What things do the three children do together ? They .
A．play baseball
B．play video games
C．play the guitar
D．both B&C
2NH3，根据下图判断：
2C达到了化学平衡状态，经测得平衡时C（A2）= 0.5mol／L，C（B2）="0.1mol/L" C（C）=" 1.6" mol/L。若A2、B2、C的起始浓度分别以a mol/L、b mol/L、cmol/L表示，请回答：