题目

阅读理解 The U. S. Postal Service (USPS) is losing billions of dollars a year. The government company that delivers small mail is losing out to email and other types of electronic communication. First-class mail amount fell from a high point of 104 million pieces in 2000 to just 64 million pieces by 2014. Congress permits the 600.000-empIoyee USPS to hold a monopoly (垄断) over first-class and standard mail. The company pays no federal, state or local taxes; pays no vehicle fees; and is free from many regulations on other businesses. Despite these advantages, the USPS has lost $52 billio某算法的程序框如图所示，若输出结果为12，则输入的实数x的值是 （注：框图中的赋值符号“=”也可以写成“←”或“：=”）（　　） A、1B、2C、2D、3