中国人民银行决定，自2015年6月28日起，金融机构一年期贷款基准利率下调0.25个百分点至4.85％；一年期存款基准利率下调0.25个百分点至2％。这可能会引起的经济现象有（   ）

①商业银行利润增加              ②社会融资成本降低

③社会需求总量增加              ④商品房的价格回落

阅读短文，根据短文内容选择正确的答案。

    Coffee has become the most popular American drink. Today people in the United States drink more coffee than（比）people in any of the other countries. People drink coffee at breakfast, at lunch, at dinner, and between meals. They drink hot coffee or coffee with ice in it. They drink it at work and at home. They eat coffee ice-cream and coffee candy（糖果）. Coffee is black and very strong. Different people like to drink it in different ways. Some people like coffee with cream or sugar in it. Other people like coffee with both cream and sugar in it. In all ways it is served（提供服务）. Coffee has become an international（国际的）drink.

①巩固公有制的主导作用            
②进一步提升国有经济竞争力

③取消国有经济对国民经济的控制力   
④促进各种所有制经济依法平等使用生产要素

生命起源的过程中形成的有机小分子主要是（  ）

阅读图文材料，完成下列各题。

材料一：美国人口普查局2015年12月21日公布了2015年全国人口普查报告。报告显示截至2015年4月1日，美国总人口为3.087亿，比2005年增长9.7%。

材料二：美国人口增长和人均寿命变化示意图（1900~2008年）。

材料三：美国本土略图。