A:must have studied
B:should have studied
C:could have studied
D:studied
徐天麟在《西汉会要》中说:“汉祖龙兴,取周秦之制而兼用之,其亦有意于矫前世之弊矣。”这里“矫前世之弊”主要是指( )
培养细菌和真菌的____ 和____ ,在接种前必须____ 。
经调查表明,人类疾病50%至80%与不良心态、恶劣情绪有关。这说明( )