—Excuse me, can I smoke here?    

—No,             .       [ ]

A. you must      

B. you'd not better      

C. you can      

D. you'd better not

扩张型心肌病与心包积液的鉴别主要在于（）

A.前者心音低沉

B.后者心尖搏动在心浊音界左缘内侧

C.后者心尖搏动减弱

D.前者心脏普遍增大

E.两者发病年龄不同