About 110 million people moved to this city. The population is ______ as ten years ago.

A．as twice large

B．twice as large

C．as many twice

D．twice as many

关于主动脉瓣狭窄，说法不对的是（）

A.正常的左房收缩对主动脉瓣狭窄病人十分必要

B.主动脉瓣狭窄的三大症状是心绞痛、晕厥和呼吸困难

C.主动脉狭窄时左室向心性肥厚是主要代偿机制

D.冠状动脉正常的主动脉瓣狭窄病人不会有心绞痛

E.主动脉瓣狭窄病人术中心肌保护较一般心脏病手术更重要