单项选择题

甲状软骨是呼吸道中唯一完整的软骨环，对维持呼吸道通畅有重要作用。（）

A．对
B．错

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多项选择题

AutoCAD的二维坐标可分为( ) 。A.直角坐标B.极坐标C.UCS坐标D.三维坐标

单项选择题

Who are “Abolitionists”? A.
people who showed more obedience to the Constitution’s guarantee B.
fugitives from the southern states C.
people who believed that slavery was wrong and evil D.
people who are favorable of the slavery