正确答案: A

不变

题目：沿单根神经纤维传导的动作电位的幅度 （ ）

解析：A

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举一反三的答案和解析：

[单选题]

肝绝对浊音界下移，肝区叩痛荫性

解析：B,D

[多选题]下列各项属于条件反射的是

需后天学习获得

刺激性质与反应之间的关系可变

解析：AC

[单选题]Passage FiveIn the United States, it is important to be on time, or punctual, for an appointment, a class, etc. However, this may not be true in all countries. An American professor discovered this difference while teaching a class in a Brazilian (巴西的) university. The two-hour class was scheduled' to begin at 10

being on time

解析：

51．答案为D  根据文章第一句it is important to be on time，or punctual可知punctual的意思是“守时”。

[单选题]On her last night in the house, Mrs. Robson was feeling _______.

a bit sad but not entirely unhappy

解析：

    41．答案为D  此考题为细节题。文章第2段告诉我们：...(Mrs．Robson)was sad at the thoughtof，leaving the house．  as it was full of so many memories．But at the same  time  she was looking forward  to spending her last years near the sea，因此我们应选择D。

[单选题]下列关系中，不属于民法调整的财产关系的有（ ）

国家因建设需要征用甲村的土地而形成的土地征用关系

解析：A项、C项属于民法调整的财产流转关系，D选项属于民法调整的财产归属关系，B选项不具有平等、自愿性质，故不为民法调整的财产关系。所以，选择B项。

[单选题]《五代史伶官传序》是一篇 （ ）

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