正确答案: D

回结肠动脉

题目：阑尾动脉发自 （ ）

解析：D

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举一反三的答案和解析：

[单选题]Why do you think they had not a backup computer?

Because it was very expensive.

解析：

38．答案为B  根据各选项的比较及逻辑推断，没有备用电脑可能是经费问题，得出此题的答案为B。

[单选题]土壤细菌和豆科植物的根系所形成的共生体称为( )

根瘤

[单选题]细胞生活的内环境是指而言 （ ）

细胞外液

[单选题]在休克监测中，哪项观察结果表示预后极差甚至死亡率可达100%( )

乳酸盐浓度超过8.mmol／L

[单选题]下列作品属于郭沫若所创作的一组是( )

《屈原》、《虎符》、《蔡文姬》

解析：【答案】D

[单选题]Eggs are my favorite food. I like them (21) , hard-boiled, scrambled, or poached. 1 eat eggs for (22) , lunch, and dinner. I eat eggs here, there, and everywhere!Eggs taste great. You can eat them by (23) or as part of any meal. Eggs are (24) used as an ingredient in many prepared foods. Can you think of any foods that contain (25) ?

fried

解析：21．根据后面列举的词，可以看出这里应是一种鸡蛋的烹调方式。选项 A是正确的。