肝肠循环最显著的强心苷是
A．洋地黄毒苷B．地高辛C．毒毛花苷KD．去乙酰毛花苷CE．以上药物均无肝肠循环
参考答案：A
When they arrived at the school it was raining _______ harder.
A. more B. quite C. very D even
组织创新系统的关键要素有（）。
