下肢静脉曲张行静脉造影显示静脉全程通畅呈直桶状，提示（）。
A.单纯性下肢静脉曲张
B.动静脉瘘
C.交通支瓣膜功能不全
D.下肢深静脉血栓形成后遗症
E.原发性下肢深静脉瓣膜功能不全
参考答案：E
解析：原发性下肢深静脉瓣膜功能不全时下肢静脉顺行造影显示如下特点：深静脉全程通畅，明显扩张；静脉瓣模糊或消失，失去正常的竹节状形态而呈直筒状；Valsalva屏气试验时，可见含有造影剂的静脉血自瓣膜近心端向瓣膜远侧逆流。其他都不会表现直筒状静脉。故选E。
From Monday to Friday most people are busy working or studying, but in the evenings and weekends they are free and 31 themselves. Some watch television or go to the cinema, others take part in sports. This is decided by their own 32 . There are many different ways to spend our free time. Almost everyone has some kind of 33 : it may be something from collecting stamps to ____34___ model planes. Some hobbies are very 35 , but others don’t cost anything at all. Some collections are worth(值得…的) 36 of money, others are valuable(有价值的) only to their owners. I know a man who has a coin collection worth several 37 dollars. A short time ago he bought a rare(罕见的)fifty-cent piece which 38 him $250! He was very happy about this collection and thought the price was all right. On the other hand, my youngest brother collects match boxes. He has almost 600 of them, but I wonder(怀疑) if they are worth any money. However, 39 my brother they are quite valuable. 40 makes him happier than to find a new match box for his collection.
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