—It's been such a wonderful evening with you! Thank you very much!
—_______
A:Glad to hear that.
B:My pleasure!
C:It's nothing.
D:No thanks.
人口问题的本质是( )
①违背了国家税收的固定性特征
②有利于企业转型升级和技术创新
③表明了财政政策是调节经济的重要手段
④是国家运用货币政策减轻企业负担的表现