It is reported that the United States uses _______ energy as the whole of Europe.  [ ]

A. as twice

B. twice much

C. as twice much

D. twice as much

关于体腔上皮来源的肿瘤哪种说法是正确的：

A．来源于原始体腔的间叶组织

B．向胚外结构分化形成内胚窦瘤

C．常具有内分泌功能

D．具有分化为各种苗勒上皮的潜能

E．向宫颈粘膜分化形成浆液性肿瘤