As a result of the heavy snow，two-thirds of the buildings in the area           .

A. need to repair       B.needs to repair C.needs repairing   D need repairing.

关于妊娠性滋养细胞瘤下列哪项正确

A．侵蚀性葡萄胎可发生在流产之后

B．绒毛膜癌可发生在葡萄胎之后

C．绒毛膜癌最早出现的转移为肝转移

D．前次妊娠为异位妊娠，此次发生绒毛膜癌的机率较大

E．绝经后不再发生绒毛膜癌