西方经济学一般认为，改变政府购买水平对宏观经济的效果，（    ）改变税收和转移支付的效果。

(单选题)2017年，来自东北、北部沿海、黄河中游及长江中游地区的北京常住外来人口人数约为多少万人？（ ） (单选题)2017年，朝阳区和海淀区的外来人口占两个区的常住人口的比例为（ ）。 (单选题)2016年，北京市常住人口中非外来人口为多少万人？（ ） (单选题)( ) if I had arrived yesterday without letting you know b (单选题)The opening ceremony is a great occasion. It is essential ( (单选题)Quality is ( ) counts most. (单选题)The government has promised to do ( ) lies in its power t (单选题)If not ( ) with the respect he feels due to him, Jack get (单选题)Time ( ), the celebration will be held as scheduled. (单选题)Miss Smith and I keep in touch ( ) writing often.