A:乙醇的结构简式:C2H6O
B:HCl的电子式:
C:硫离子的结构示意图
D:乙烷的分子式:CH3—CH3
例
uncle
Play tennis
1
aunt
Playing football
2
sister
Playing basketball
3
teacher
Playing ping-pong
4
mother
Playing volleyball
例:My uncle is playing tennis.