问题
填空题
上消化道出血常见的病因是________，________，________，________。
答案
参考答案：消化性溃疡 食管胃底静脉曲张 急性胃黏膜损害 消化道肿瘤
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上消化道出血常见的病因是________，________，________，________。
参考答案：消化性溃疡 食管胃底静脉曲张 急性胃黏膜损害 消化道肿瘤
| 阅读下面短文，请从方框中选出适当的句子填入文中的适当位置，使短文内容完整正确。 | |
 This is a street crossing. 1 Drivers must watch the lights carefully. 2 When there is a red light, the cars going straight must stop. They must wait until the red light changes to green. 3 Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or red. But they must wait until the green light is shining if they want to turn left. 4 They can't see the difference between red and green. These people must not drive, or else there will be accidents. 5
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