题目

Mary and Her FriendsMary has some friends. They are Betty, Peter, Alice and Mike. Mary is the oldest of the five. Betty is thirteen years old. She is younger than Mary and older than Peter. Alice is nine and Mike is seven.Betty and Peter are good runners. But Peter runs faster(更快地). Mary and Betty like to play basketball. Mary plays better than Betty. Alice sings best of them.Mary and Betty study in a middle school. Peter, Alice and Mike study in a primary school. They all work hard at school. But Betty works hardest. Her handwriting(书写) is good, too.根据短文内容，选择正确3．下列有关化学用语表示不正确的是（　　）A．硝基苯的结构简式：B．氯化铵的电子式：C．甲烷的球棍模型：D．乙醇的结构简式：CH3CH2OH