Americans eat____ vegetables per person today as they did in 1990. [ ]

A. more than twice  

B. as twice as many  

C. twice as many as  

D. more than twice as many

公民高治、杜焘为同一苏式居民楼邻居，高治住楼上，杜焘住楼下，现因高治希望卖出其房，杜焘找高治协商，并签订书面合同，杜焘以80万元价钱购买高治的房产。次日，高治的姐姐张风来看望高治，并提出愿出资90万元买高治的房产，高治又与张风订立书面合同，并于当天到房管部门办理了过户登记。

如果张凤明知高治与杜焘有合同在先，仍订立合同并出资购买高治的房产，张凤是否能取得该房所有权