房地产开发成本金额为( )万元。
A．450
B．550
C．615
D．600
参考答案：C
解析：30+15+450+100+20=615(万元)
My father always warns me that there is no such thing as a free lunch because we can’t get _________ for nothing．
A．something
B．everything
C．anything
D．nothing
如果商品是以信用证方式购买，其所有权在交货后转让
