问题
单项选择题
Which of the following is true
A．A representative serves for two years.
B．To become a senator is easier than to become a representative.
C．A senator performs his duties for a shorter time than a representative.
D．All presidents were representatives and then senators before becoming president of the United States.
答案
参考答案：A
解析：[分析] 是非题型。 答案出自第一段第五句The 435 members of the House are elected every two years...。