【正确答案】正确答案： American Elections National elections are held in the United States every two years. / Each time, voters elect all members of the House of Representatives for a two-year term, / and one-third of Senate members for a six-year term. / Many states also choose governors and state legislatures in national elections. / Citizens may also vote on different questions of state or local interest. / The Constitution requires the president and vice president be elected every four years. / By law, voting is to be held on the first Tuesday after the first Monday in November. / Every four years, the Democrats and the Republicans hold national conventions / to officially choose their nominees for president and vice president. /