－Dad, could you buy me a MP3 like this?    

－Of course, we can buy _____ one than this, but _____it.    [ ]

A. a better; better than    

B. a popular; as good as    

C. a more popular; not as good as    

D. a cheaper; as good as

下列哪项不是血液稀释的适应证（）

A.采集自体血

B.大量失血和休克

C.颅内压增高

D.换血疗法

E.体外循环