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问题 单项选择题

患者，男性，25岁，汽车司机。3h前撞车，上腹部被方向盘挤压伤，剑突下疼痛来诊，呕吐血性液体100ml。查体可能出现的体征是（）

A.腹壁软组织挫伤，点片状淤血

B.局限性上腹压痛

C.腹膜炎，腹肌紧张

D.肝区叩痛

E.皮下气肿

答案

参考答案：C

单项选择题

Until recently, anthropologists generally agreed that higher primates originated about 30 million years ago in the A1 Fayyum region of Egypt. However, a 40-million-year-old fossilized fragment of a lower jawbone discovered in Burma (now called Myanmar) in 1978 was used to support the theory that the earliest higher primates originated in Burma. However, the claim is premature for______.
Which one of the following, if true, is the most logical completion of the paragraph above

A．there are no more primate species in Burma than there are in Egypt

B．several anthropologists using different dating methods, independently confirmed the estimated age of the jawbone fragment

C．higher primates cannot be identified solely by their lower jawbones

D．several prominent anthropologists do not believe that higher primates could have originated in either Egypt or Burma

E．(E) other archaeological expeditions in Burma have unearthed higher-primate fossilized bone fragments that are clearly older than 40 million years
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选择题

已知条件甲：ab＞0；条件乙：a＞0，且b＞0，则（　　）

A．甲是乙的充分但不必要条件

B．甲是乙的必要但不充分条件

C．甲是乙的充要条件

D．甲是乙的既不充分又不必要条件
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