单项选择题
In Memoriam is a long ________ recording the emotional, religious and intellectual changes of the poet during the 17 years after the death of his close friend Hallam.
单项选择题 14.猪自然感染猪瘟病毒耐过后获得的免疫力属于（ ）。 A、人工主动免疫 B、人工被动免疫 C、天然主动免疫 D、天然被动免疫
判断题 He had formed a habit of doing everything together with his wife.
问答题 在补体的三条激活途径中,不依赖于抗体的是____ 和____ 。
