化脓性骨髓炎主要应与下列哪种疾病鉴别（）
A.骨髓瘤
B.骨肉瘤
C.骨结核
D.软骨肉瘤
E.早期骨梅毒
参考答案：B
Was it near the white building, if I may ask, __ __ Martin Luther King gave a speech "I have a dream"?
A．where
B．that
C．why
D．in which
传播学诞生的条件是什么？
