下列哪项不是诊断左心衰的依据()
A.劳力性呼吸困难
B.端坐呼吸
C.咳粉红色泡沫痰
D.发作性呼气性呼吸困难
E.夜间阵发性呼吸困难
参考答案:D
Never lose heart __________ difficulty you may meet with.[ ]
A. what
B. whatever
C. how
D. however