十二指肠溃疡主要表现为
A．溃疡多在十二指肠降部
B．溃疡大小多在1cm以上
C．前壁之溃疡易穿孔
D．后壁之溃疡不易出血
参考答案：C
解析：[考点] 十二指肠溃疡的特点
十二指肠溃疡多发生在十二指肠球部，以紧接幽门环的前壁或后壁最为多见。溃疡一般比胃溃疡小而浅，直径多在1cm以内。合并症之一是穿孑L，前壁十二指肠溃疡易穿孔，不易癌变。
| 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. |