何谓中和抗体？
参考答案：
病毒体的外部结构（包膜或衣壳）刺激机体产生相应抗体，此抗体能与相应的病毒结合，降低或消除病毒感染能力，即为中和抗体。
---- Have you heard of the story Monkey King? It ____ like this: There was a monkey who….
----Oh, it _____ funny and interesting.
A．tells; looks
B．comes; looks
C．goes; sounds
D．says; sounds
