根据句意及首字母提示，补全单词。

1. I like English very much. I often go to the English c______.

2.—Where does the old man l______?  

   —He lives in Hainan.

3. I don't like the picture at a______. I like that one.

4. She seldom speaks Chinese, so her Chinese is p______.

5. Kangkang and Tongtong are in the same class. They are c______.

下列关于肿瘤抗原的描述不正确的是（）。

A.肿瘤相关抗原既存在于肿瘤细胞，又存在于某些正常细胞

B.肿瘤分化抗原是正常细胞和肿瘤细胞都具有的与某个方向分化有关的抗原

C.人体恶性肿瘤都有肿瘤特异性抗原

D.肿瘤胚胎抗原在分化成熟组织中不表达或表达量很小

E.肿瘤胚胎抗原可作为肿瘤标记物用于肿瘤的辅助诊断和病情监测