參考范文about a week later, Pomilla and Andrew got to meet her son'sSavion comilla and Andrew arrived at the metro station at theappointed time, anxiously waiting for Case to come. When Casearrived with a big smile, they felt very happy and excited. Casehugged Andrew warm-heartedly and reached out his right hand, sayingto him. Would you like to take it again?"without hesitation theboy took it and held it firmly. After talking for some time, Pomillatook out the badge and gave it back to Case. Many passengers tookictures of the sceneTaylor Pomilla was moved and expressed her thanks to Caseagain She asked Case how he could calm andrew down at that timeCase told her that he had a daughter with autism and that he hadreceived special training on how to deal with autistic children. Hepromised to visit them often to help Andrew grow up happily. As hewas talking, he took out a police badge that he made by hiimself andgave it to Andrew, who was more than happy to accept it. Ever sincethen they have been friends

15.C解析:本题考查免疫的相关知识。根据题干信息可知,当受到抗原刺激时,DC表面的CD80、CD83和CD86会大量表达,从而激活T细胞,所以DC会增强特异性免疫反应,A项正确;DC相当于是吞噬细胞,没有特异性,能识别和传递多种抗原,B项正确;产生抗体的是浆细胞,C项不正确;DC功能低下的部分患者在接种乙肝疫苗后不能产生对乙肝病毒的免疫应答,说明患者接种疫苗后,DC表面标志性蛋白CD80、CD83、CD86的表达较低,D项正确。

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