—What did you do on your school trip?         

—I _____ with my friends and bought a souvenir.         [ ]

A. hang out    

B. eat some ice cream    

C. hung out    

D. see some sea seals

感染性心内膜炎，行人工瓣膜置换的指征是：（）

A.脾肿大伴左上腹疼痛并闻及摩擦音

B.中度贫血有杆状指

C.高热持续不退，白细胞持续升高

D.皮下出血点增多

E.瓣膜穿孔