主要兴奋β2受体的是（）
A．肾上腺皮质激素
B．沙丁胺醇
C．氨茶碱
D．东莨菪碱
E．色甘酸钠
参考答案：B
When he heard the news, he was very . [ ]
A. surprising surprised
B. surprised surprising
C. surprised surprised
D. surprising surprising
什么是商务宝业务？
