卡环的组成由（）
A.支托
B.卡环臂
C.卡环体
D.卡环肩
E.连接体
参考答案：A, B, C, E
My home is no more than one mile from the school and there are many trees( ).
A．for many
B．among them
C．in between
D．from each other
肺是______系统的主要器官，是______的场所．
