病变以深部静脉为主的疾病是
A．血栓闭塞性脉管炎B．闭塞性动脉硬化症C．末端动脉痉挛症D．静脉血栓形成E．下肢静脉曲张
参考答案：D
根据括号内的汉语提示,写单词完成句子。
1. She _____( 寄) a postcard to her mother yesterday.
2. Here is a map of ______( 欧洲).
3. I often swam in the ______( 湖) near my house when I was young.
4. My grandpa lives in the ______( 农村).
5. Jerry couldn't stand city life and went back to _______( 大自然).
已知二叉树后序遍历序列是dabec，中序遍历序列是debac，它的前序遍历序列是( )。
A．cedba
B．acbed
C．deeab
D．deabe
