Slavery was () in Canada in 1833, and Canadian authorities encouraged the slaves, who escaped from America, to settle on its vast virgin land.

A．diluted

B．dissipated

C．abolished

D．resigned

骨转移癌病人血钙浓度增高原因为（）

A.长期卧床缺钙

B.病理骨折可释放钙

C.低蛋白血症，致血液中游离钙浓度升高

D.溶骨性破坏

E.类甲状旁腺素分泌高