风湿性心内膜的病变是
A．血管周围肉芽肿形成
B．疣状心内膜炎
C．浆液性心内膜炎炎
D．内膜大片坏死
E．心内膜穿孔
参考答案：B
左心衰竭晚期的症状是 （）
A.劳力性呼吸困难
B.咳粉红色泡沫痰
C.端坐呼吸
D.咳嗽、咳痰
E.夜间阵发性呼吸困难
We ______ 1, 000 English words since we ______ to this school. [ ]
A. learn; come
B. have learned; came
C. have been learning; came
D. have learned; come
