抗原
参考答案：能诱导机体发生免疫应答并能与相应抗体或T淋巴细胞受体发生特异性免疫反应的大分子物质。
The old town has narrow streets and small houses ________ are built close to each other.[ ]
A. they
B. where
C. what
D. that
有“神品”之称的是( )。
A．宜兴紫砂壶
B．洛阳仿唐三彩
C．景德镇的名瓷
D．龙泉青瓷
