You don't have to know the name of the author to find a book. You ____find the book by the title. [ ]

A. must

B. need

C. can

D. would

多数神经鞘瘤CT扫描密度较低的原因是（）

A、肿瘤一般较小。

B、含脂肪成分多。

C、多为良性肿瘤。

D、容易发生坏死。

E、肿瘤血管成熟。