A terrorist attack        at Kunming Railway Station ,and 29 people        in the event .

A．was happened , may be killed

B．happened , killed

C．happened , were killed

D．happened , are killed

子宫内膜间质肉瘤的组织学特点包括：（）

A．肿瘤细胞在形态上和正常子宫内膜间质细胞相似

B．肿瘤间质内见有与子宫内膜螺旋小动脉类似的小血管

C．瘤细胞有在淋巴管内生长的倾向

D．肿瘤性间质细胞常浸润平滑肌并引起坏死

E．可以出现血管外皮瘤样结构