【正确答案】 D

【答案解析】[听力原文] Every four years, Americans elect a president. {{U}}According to the constitution any American citizen over 35 years of age who was born in the U.S. can be president.{{/U}} There are always many candidates who hope they will be elected. There are many political parties in the United States, and most of these will have candidates for president. However, two political parties are much stronger than the others. They are called the Democratic Party and the Republican Party. For over a hundred years, the man elected as president has always been either a Democrat or a Republican. All American citizens over 18 years of age can vote for a president. The process of electing a president takes nearly a year. During the election year there are numerous local elections, called primary elections, held in many of the fifty states. These elections indicate who the most popular candidates are. {{U}}In primary elections, usually held in the winter and spring, candidates run against members of their own parties.{{/U}} In this way they try to get support of party members around the country. During the summer, both parties have conventions where the party members make the final choice for the party's presidential candidate. Each party chooses a person to run for president and a person to run for vice president. The two candidates work as a team. They will win or lose the election together. {{U}}Once the final candidates are chosen, they campaign around the country, trying to win votes.{{/U}} The national election is held in November. The candidate who wins becomes president the following January. Who can be elected as the president of America?