上消化道出血病因诊断的首选检查措施为（）
A.X线钡餐造影检查
B.选择性动脉造影
C.内镜检查
D.化验检查
E.吞线试验
参考答案：C
解析：内镜检查为上消化道出血病因诊断的首选检查方法。一般在上消化道出血后24～48小时内急诊行胃镜检查，在直视下顺序观察食管、胃、十二指肠球部等，判断出血部位及出血情况，不仅可明确病因，同时可做紧急止血治疗。
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| Here is a story about a clever dog. It was a seeing-eye dog. A seeing-eye dog can help blind (瞎的) people walk along the streets and do many other things. One day a seeing-eye dog and a blind man __1__ on bus together. The bus was full of __2__ and there were__3__ seats left. But one man soon stood up and left his seat. The dog __4__ the blind man to the seat, but there was little space (空间) for two people. The dog began to push the people on each side __5__ his nose. He pushed and pushed until the people moved and __6__ there was __7__ space for two people. The blind man than sat down and the dog got up on the seat at his side. The dog __8__ down and put his head on the leg of the __9__ man. He was very comfortable and soon fell asleep. Everyone on the bus __10__ at the dog. | |||
| ( ) 1. A. got ( ) 2. A. foreigners ( ) 3. A. no ( ) 4. A. told ( ) 5. A. for ( ) 6. A. at first ( ) 7. A. less ( ) 8. A. went ( ) 9. A. old ( )10. A. smiled | B. went B. policemen B. not many B. asked B. to B. still B. enough B. put B. blind B. watched | C. came C. people C. enough C. carried C. with C. at last C. few C. lay C. young C. laughed | D. put D. farmers D. some D. took D. at D. last D. litter D. jumped D. first D. looked |