正确答案: ABCE

接头小泡释放乙酰胆碱 乙酰胆碱与接头后膜受体结合 接头前膜对Ca2+通透性增加，Ca2+内流 接头后膜去极化产生终板电位

题目：神经一肌肉接头的兴奋传递包括 （ ）

解析：ABCE

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举一反三的答案和解析：

[单选题]How many students were shot dead in 1997 in US schools?

9

解析：

49．答案为B。根据题干找到第四段可知。

[单选题]认为发展的实质是新事物的产生和旧事物的灭亡的观点是（ ）

辩证唯物主义观点

[单选题]开口于上鼻道的是 （ ）

筛窦后群

[单选题]根据以下选项，回答 99～100 题：

传导

[单选题]在长篇小说《奥勃洛莫夫》中塑造了懒惰成性、不可救药的“多余人”典型形象的作家是_____。( )

冈察洛夫

[单选题]下列属于无因管理的是( )。

路遇他人伤犬，送去救治

解析：D。本题考查无因管理的构成要件问题。无因管理要求行为人首先没有法定或者约定的义务，其次必须是为了避免他人利益受损失而进行管理或者服务的。

[单选题]The main idea of Paragraph Four shows us ______.

some examples of shoot in US schools

解析：

48．答案为A。根据第四段描述内容作出该项选择。

[单选题]Passage ThreeMany theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form. a crust of rock that was many miles thick.

the origin of the ocean

解析：

41．答案为B。根据第一段第一、二句，Many theories about the origin of the ocean have been proposed by scientists．The most widely accepted one is that...作出该项选择。