心源性哮喘常见于下列哪些疾病（）
A.喘息型慢性支气管炎
B.风湿性心脏瓣膜病
C.过敏性哮喘
D.中毒性呼吸困难
E.气胸
参考答案：B
花生四烯酸代谢产物的作用不包括：
A．弓I起疼痛B．使血管通透性升高C．引起发热D．加重组织损伤E．促进白细胞游出
______ these tests were being conducted, she was able to read a newspaper.
A．During
B．On occasion
C．While
D．As if
