问题
选择题
The United States _______one of the lowest smoking rates －25.5 percent of the population.
A．is
B．have
C．has
D．are
答案
答案：C
考察主谓一致.句意:美国有最低的吸烟率_人口的22.5%. be动词的意思是,故用have没The United States指的美国,为第三人称单数,故谓语动词用单属形式,选C.