结核性胸膜炎出现（）
A.肺源性呼吸困难
B.心源性呼吸困难
C.血源性呼吸困难
D.中毒性呼吸困难
E.神经、精神性呼吸困难
参考答案：A
His sister left home in 1998, and ________ since. [ ]
A. had not been heard of
B. has not been heard of
C. had not heard of
D. has not heard of
从哲学角度看，漫画给我们的启示有[ ]
①要坚持具体问题具体分析
②要坚持求真务实的工作态度
③要坚持真理的客观性
④要投身社会变革的行动
A、①②
B、①③
C、③④
D、②③
