I'm worried that I don't know ____ the composition. Don't worry! Read this book first, and then you'll

get an idea. [ ]

A. how to write

B. when to write

C. what to write

D. where to write

肿瘤血道转移的确切根据是（）。

A.恶性肿瘤细胞侵入静脉

B.恶性肿瘤细胞侵入动脉

C.血液中查见肿瘤细胞

D.肿瘤细胞栓塞于远隔器官

E.在远隔器官形成同一类型的肿瘤