突出危险工作面（）专职瓦斯检查员检查瓦斯。
参考答案：必须设置
________ with her work, she didn't even notice the heavy snowfall outside the window.
A．Occupying
B．To be occupied
C．Having occupied
D．Occupied
具有保护肥大细胞，减少生物活性物质的释放作用（）
A．异丙肾上腺素
B．色甘酸钠
C．氨茶碱
D．糖皮质激素
E．沙丁胺醇
