_______air pollution getting worse, the government needs to come up with some effective measures to deal with it.

A．Because

B．For

C．As

D．With

下列各项中，符合房产税纳税义务发生时间规定的有( )。

A．将原有房产用于生产经营，从生产经营之次月起缴纳房产税

B．委托施工企业建设的房屋，从办理验收手续之次月起缴纳房产税

C．购置存量房，自权属登记机关签发房屋权属证书之次月起缴纳房产税

D．购置新建商品房，自权属登记机关签发房屋权属证书之次月起缴纳房产税