下列关于美国宪法的说法正确的是( )。
A. 美国是世界上最早实行宪政的国家
B. 美国宪法是世界上第一部成文宪法
C. 美国是典型的不成文宪法国家
D. 美国宪法以《人权宣言》为序言
引起肺褐色硬化的常见病变为
A. 二尖瓣狭窄
B. 三尖瓣狭窄
C. 肺动脉栓塞
D. 急性肺淤血
E. 右心衰竭
In Victorian Age, the______became the most widely read and the most vital and challenging expression of progressive thought.
A. poetry
B. novel
C. essay
D. prose
We should be able to do the job for you quickly, () you give us all the necessary information.
A. in case
B. provided that
C. or else
D. as if