对α受体和β受体均有强大激动作用的药物是（）。
A.去甲肾上腺素
B.可乐定
C.异丙肾上腺素
D.肾上腺素
E.多巴酚丁胺
参考答案：D
Many children, ________ parents are away working in big cities, are taken good care of in the village.[ ]
A. their
B. whose
C. of them
D. with whom
要长期进行静脉给药者，为保护静脉应从远端至（）选择血管进行注射。
