疾病发生的重要条件是（）
A.邪气亢盛
B.正气受损
C.邪气不足
D.正气不足
E.正气抗邪
参考答案：A
Arriving home, she started with math. She had always been a good math student, but now she was . [ ]
A. struggling
B. improving
C. working
D. complaining
现代管理理论的发展趋势是怎样的？
