宪法具有最高的效力等级，是其他法律的立法依据和基础，其他法律不能违背它的规定或者精神，否则无效。
参考答案：对
He _______ more visits to his parents.He has been regretting not doing so since they passed away.
A．should pay
B．would pay
C．should have paid
D．would have paid
产后大出血，继则冷汗淋漓，甚则晕厥。其病机是
A．气滞血瘀B．气不摄血C．气随血脱D．气血两虚E．气血失和
