引起支气管持续痉挛的主要介质()
A.组胺
B.白三烯(LT)
C.前列腺素
D.激肽
E.内啡肽
参考答案:B
—Ipreferspeaking to listeningin English learning.
—Oh, really! I think you should be good at ______ of them.
A.both
B.neither
C.some
D.all
二C计划