题目

下图表示的是病原体进入小鼠体内后的免疫过程，请回答：【1】图1中X细胞是______________细胞，Y细胞是______________细胞。【2】图1中Y细胞分泌的B物质称____________，除了分泌B物质外，Y细胞还能直接参与攻击抗原细胞，导致其____________增大而解体死亡。【3】图中能表现免疫特异性的结构是____________（填编号）。【4】图1所示由X细胞参与的免疫反应称为_____________________。【5】图2为某小鼠血液中某种抗体的浓度随时间变化的曲线，第21天血液中产生的抗体The sentence "Food or drink shouldn't be taken into the concert hall.” means_________. A. People can take food and drink into the concert hall. B. People can have either food or drink in the concert hall. C. People are not allowed to take food or drink into the concert hall. D. No people are allowed to have food or drink out of the concert hall.