使气管扩张的因素有
A.迷走神经兴奋
B.组胺
C.交感神经兴奋
D.肾上腺素
E.5-HT
参考答案:C,D
我会给形近字组词。
孩( )该( ) 晴( )睛( )
外( )处( ) 壮( )状( )
Only after Mary read her composition the second time_________ the spelling mistake.[ ]
A. did she notice
B. she noticed
C. does she notice
D. she has noticed