We don’t have much homework now and our school-bags are _____ they used to be.   [ ]

A. as heavy as

B. as heavily as

C. not as heavily as  

D. not so heavy as

洋地黄类药物最适用的情况是（）

A.扩张型心肌病发生快速室率心房颤动伴肺淤血

B.肥厚梗阻型心肌病

C.二尖瓣狭窄伴肺淤血

D.心包积液伴呼吸困难

E.主动脉瓣狭窄伴肺淤血