正确答案: B

左肺动脉起始部和主动脉弓下缘之间

题目：动脉韧带位于( )

解析：B

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举一反三的答案和解析：

[单选题]下列关于消化期胃液头期分泌机制的叙述，不正确的是

口腔咀嚼动作可以引起胃酸分泌

[单选题]Passage FiveIn America, every student in his or her second year of high school is required to take a class in driver's education.

is offered to all the students of Grade 2 in high school

解析：

51．答案为D  根据第一段every student in his or her second year of high school is required to take a class in driver's education可知高中二年级的学生必须修驾驶课。

[单选题]柏拉图在《理想国》中要驱除——。（ ）

诗人