某患者，超声心动图检查：各心腔大小及各瓣膜结构未见异常，房室间隔完整，彩色多普勒心室腔内有异常的高速血流，似来自心腔壁的某处，且呈双期的血流，此时应注意观察何部位（）。
A.动脉导管
B.主动脉及肺动脉间隔
C.主动脉窦
D.左右冠状动脉瘘
E.肺动脉及肺静脉
参考答案：D
解析：排除其他心脏疾患后，在心腔内探及来自室壁的高速血流，且为双期血流，应考虑冠状动脉瘘可能。
| 阅读短文，把方框中的选项还原到短文中，使短文完整、通顺，然后为第5题选择正确选项。 | |
| Fire can help people in many ways. But it can also be very harmful. Fire can heat water, warm your houses, give light, and cook food. 1. It can burn trees, houses, animals, or people. Sometimes big fires can burn forests. Nobody knows for sure (确实) how people began to use fire. But there are many interesting old stories about the first time a man or woman started a fire. One story from Australia tells about a man very, very long time ago. 2. Today people know how to make a fire with matches. Children sometimes like to play with them. But matches can be very dangerous. One match can burn a piece of paper, 3. A small fire can become a big fire very fast. Fires kill many people every year. So you must be careful with matches. 4. Fires need oxygen. Without oxygen they die. There is oxygen in the air. Cover a fire with water, sand, or in an emergency (紧急情况), with your coat or something else. This keeps the air away from a fire and kills it.
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| 5. Which of the following is NOT talked about in the passage? | |
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| A. Fire can be used to heat water. B. Fire can be used to warm our houses. C. Fire can be used to cook food. D. Fire can be used to dry our clothes. |
