下列哪项不是急性左心衰竭的体征（）
A.奇脉
B.舒张奔马律
C.心率增快
D.心尖区收缩期杂音
E.心脏增大
参考答案：A
The rate of unemployment in America after the worldwide economic crisis may be ______ reported earlier.
A．as twice high as
B．twice as high as
C．as high twice as
D．as high as twice
最常见的腰椎黄韧带增厚，钙化的原因是（）
A.转移瘤
B.原发肿瘤
C.结核
D.外伤
E.退行性改变
