My teacher has never lost his temper; that is to say, he is a _____ man.   [ ]

A. generous            

B. mild              

C. rude              

D. tough

多发性骨髓瘤的特点有（）

A.血中有大量M蛋白

B.尿中有本周蛋白

C.骨髓中有大量异常浆细胞

D.正常的免疫球蛋白含量增高

E.原发性溶骨损害