风湿性心瓣膜病常有并发症包括下列哪几项()
A.充血性心力衰竭
B.心房颤动
C.亚急性感染性心内膜炎
D.栓塞
E.心包炎、心包积液
参考答案:A, B, C, D
They all looked _____ at the teacher when he told them the good news.
A. sadly
B. happily
C. carefully
D. angrily
The arrival of the European settlers had a great on the life of the Native Americans.
A.fault
B.change
C.effect
D.result.