化脓性骨髓炎的X线表现为（）
A.骨质破坏
B.死骨形成
C.骨膜增生
D.新生骨
E.软组织肿块
参考答案：A, B, C
随着地球不停的自转，地球表面产生了 [ ]
A、季节变化
B、昼夜交替现象
C、地表高低不平
D、海陆变化
Stressful environment leads to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.
A．by chance
B．in other words
C．in return
D．in turn
