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问题 单项选择题 A1/A2型题

有关胃、十二指肠溃疡急性穿孔，错误的是（）。

A.发病率男高于女

B.多发生于胃、十二指肠的前壁

C.既往80%～90%有溃疡病症状

D.70%～80%病人膈下可见游离气体

E.确诊后应立即行胃大部切除术

答案

参考答案：E

解析：胃、十二指肠溃疡外科治疗的适应证包括：①有多年的溃疡病史，症状有逐渐加重的趋势，发作频繁，持续时间较长，影响身体营养和正常生活；②内科治疗无效或愈合后复发，或经X线钡餐检查溃疡龛影较大、球部变形较严重、穿透到十二指肠壁外或球后溃疡；③出现严重并发症急性穿孔、大出血、瘢痕性幽门梗阻、溃疡不能除外、恶变或已经恶变者；④胃溃疡手术适应证比十二指肠溃疡要宽些。故答案应选E。

单项选择题

成年男性正常血红蛋白浓度（）。

A.60～80g／L

B.90～110g／L

C.110～150g／L

D.120～160g／L

E.140～160g／L
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单项选择题

Should we care if over 150 known species of animals have (91) from the earth in the last fifty years Should we be concerned that there are (92) thousands of species whose very existence is (93) endangered—largely because of our activities (94) , after all, is the natural end of populations. Species are born, then (95) , and then die. Some live a (96) time, perhaps millions of years; some die more quickly. We have (97) the extinction of many species we know about, and we have undoubtedly sealed the (98) of others. In fact, there are undoubtedly many other species that have lived among us during our time on earth, but that have disappeared as a (n) (99) of our activities without our ever having known they existed.
It is hard to explain the rationale of many of us who are concerned about such matters. I have never seen a sea whale, (100) I don’t want them to become extinct. Moreover, I felt this way long before I understood anything about how they might be an important part of an ecosystem. Possibly such feelings merely reflect the cultural attitude that it is "nice" to wish other living things well; thus, the attitude is (101) . I feel nice.
There are, of course, more rational reasons for (102) the extermination of any species. For one thing, the kind of attitude that encourages or sanctions the destruction of other species is a threat (103) our own wellbeing. If such an attitude exists, we ourselves might (104) victim to it. living things (including us) might be expected to fare better where there is (105) for life. The extinction of other species could also threaten us (106) by simplifying the system of which we are a part or by destroying parts of the ecosystem (107) which we directly rely. For example, if we continue to poison the oceans (108) we are willing to believe only a few bottom dwellers are affected, we might (109) overstep some critical threshold and trigger the wholesale death of plankton, thus finding ourselves without a major (110) of the world’s food and with our oxygen supplies dwindling.

A．effect

B．result

C．issue

D．event
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