对骨肿瘤的诊断、鉴别诊断，最有价值的检查是
A．X线片
B．放射性核素骨扫描
C．MRI
D．查ALP
E．组织活检
参考答案：E
空元的功能是
A．持载和固定B．湿润和聚拢C．温和和熟腐D．使万物运动和保持干燥E．为万物运动和生长提供空间
—We'll go to Qing Yuan Mountain tomorrow. Why _____ join us?
—That's a good idea. [ ]
A. not
B. don't
C. can't
D. didn't
