填空。

     Finally, we arrived at the World Park. The sky was blue and __1__ was beautiful. We became very

 __2__ when we saw the model Eiffel Tower from the coach! It is made of __3__ and really tall. When

  the coach stopped, we all got off quickly. Kitty and I didn't feel __4__ any more. We just wanted to go

  into the park and enjoy__5__ . Then the real __6__ came, like bombs under the ground. The earth

 started to __7__ . People ran in all __8__ . They did not know where to go. Some people ran out of the

  shopping __9__ . I tried my best to run to the street too. People were running wildly while pieces of glass

  and bricks were __10__  down. Then the walls began to come down, too.

某市外资房地产开发企业，2011年有关经营情况如下：
(1)2月有偿受让一块土地使用权，占地面积30000平方米，支付价款3000万元，支付相关费用100万元；
(2)全部土地的“三通一平”费用600万元，开发间接费600万元；
(3)第一期工程开发写字楼于11月30日竣工，写字楼占地面积10000平方米，建筑面积60000平方米；按合同约定支付给建筑承包商的开发成本7200万元。
(4)11月竣工后当年对外销售写字楼90%，共计收入16200万元(包括代政府收取的费用200万元，此费用计入房价向购买方一并收取)。
(5)在售房过程中发生销售费用1500万元：发生管理费用900万元。
(6)企业分项目核算利息支出，第一期工程开发中支付的给某银行的贷款利息为700万元，并能提供金融机构证明，该笔利息支出计入开发间接费中的金额有500万元，200万计入财务费用中核算。
(说明：计算土地增值税开发费用的扣除比例为5%)
根据以上资料和税法有关规定，回答下列问题：

征收土地增值税时应扣除的开发成本金额为( )万元。

A．6200

B．3100

C．6660

D．6690