支气管、血管、神经、淋巴管等进入的门户（）
A.肺门
B.肺叶
C.肺根
D.肺泡
E.肺段
参考答案：A
根据句意及首字母或汉语提示完成句子。
1. What are you going to do during the summer v_____?
2. Your p_____ sounds like fun.
3. You look tired. You should try to r_____ yourself.
4. I want to v_____ Tibet with my parents thissummer.
5. —Who are you going w_____?
—_____.
—I'm going with my parents.
6. She is _____ (临时照顾) her sister.
已知二叉树BT的后序遍历序列是dabec，中序遍历序列是debac，它的前序遍历序列是______。
A) cedba B) acbed C) decab D) deabc
