告别GDP崇拜,保持中国经济的合理增速,是打造中国经济升级版的客观需要。阅读材料,回答问题。

材料一

注:2013年,全球GDP平均增速为4.2%。据估计,2013年我国大约消耗全世界20%的能源,单位GDP能耗约为世界平均水平的2.5倍,是美国的3.3倍,日本的7倍左右。

材料二　当前,中国经济在创造奇迹的同时也存在着产品附加值低、生态代价高等主要问题。与此同时,商品质量、食品安全等领域也问题多发,不适应人民奔向更加美好生活的要求。中国经济提质增效迫在眉睫。

材料三　当前,中国经济发展与资源环境的矛盾日趋尖锐,加快转变经济发展方式刻不容缓。2013年6月,******强调,要改进考核方法手段,把民生改善、社会进步、生态效益等指标和实绩作为重要考核内容。2013年12月,中央组织部印发的《关于改进地方党政领导班子和领导干部政绩考核工作的通知》明确规定,不能仅仅把地区生产总值及增长率作为政绩评价的主要指标,不能搞地区生产总值及增长率排名。截至2014年2月15日,全国有22个省(区、市)调低了2014年GDP增速目标,7个省(区、市)与去年持平。告别“唯GDP论”成为中国经济提质增效的主动选择。

演替过程中灌木逐渐取代了草本植物，其主要原因是（    ）

      Computers can help many workers. They can also help thieves.
      There was one thief who worked in a bank of the United States. He paid for everything he needed by check (支票). Then he told the computer not to take any money from his account for the checks he wrote. The bank's computer did what he said. And it did not take any money from his bank account. One day the computer broke down. People had to do the computer's work. They soon found out what was happening.
      Another thief, who worked for a bank saw people filling in deposit forms (存款单). Many of these people did not know their account numbers, so they wrote only their names on the forms. They left empty places for their account numbers. The thief wrote his own account number in this place. When the computer read these forms it looked only at the account numbers. It did not look at the customers' names. It paid the money on these deposit forms into the thief's account .                           
       Then there was the bank worker who told the bank computer to take ten cents off every customer's account each month and put it into his own account. For a long time the bank's customers did not notice that they were losing ten cents every month. But then someone did notice and told the bank. That was the end of that little game!

下列实验能成功的是

在含Na₂CO₃和NaHCO₃各1mol的混合溶液中加入0.5mol下列物质，其中能使HCO₃^－的数目减少，CO₃^2－ 数目增加的是（      ）