39. As we have known from the map of the world, this is ______.

A．twice as large an island as that

B．twice as larger as that island

C．as twice as that one

D．twice as a large island as that

关于肺癌痰脱落细胞学检查的阳性率，下列哪些说法正确（）。

A.与标本是否符合要求有关

B.与病理科医生水平有关

C.与肺癌的组织病理类型有关

D.与送检标本的次数有关

E.与肿瘤生长的部位有关