特征性胸椎下段及腰椎成角畸形见于
A．强直性脊柱炎B．佝偻病C．脊椎骨软骨炎D．脊柱退行性变E．脊柱结核
参考答案：E
996+997+998+999的值是( )。
A．3980
B．3990
C．4000
D．4010
_____ you study, _____ grades you will get. [ ]
A. The hard, the good
B. The harder, the better
C. Harder, better
