下列哪项是诊断恶性骨肿瘤的最主要根据()
A.局部疼痛,夜间重
B.突然生长迅速
C.切除后复发
D.发生转移
E.病人消瘦
参考答案:D
This new model of car is so expensive that it is beyond the reach of those with________income.[ ]
A.frequent
B.traditional
C.extra
D.average
简述社会价值和个人价值的辩证关系。