多发性肌炎的病理特点是
A．肌组织炎性细胞浸润
B．坏死性血管炎
C．脂膜炎
D．肌束周围萎缩
E．表皮过度角化
参考答案：A
56. I found _______impossible for _______to work out the maths problem.
A．it; him
B．it; he
C．that; him
D．that; he
危险行为
