The United States will hold local, state and national elections this Tuesday. It seems that the Democrats (民主党) may be in a position to end Republican control of one or both houses of Congress. Seventy percent of the fifty states will elect governors (地方长官). If the Democrats win four more of these than they have now, the Republicans would also lose their majority at the state level. So both parties are fighting hard. Elections in America bring a flood of political advertising, especially on television. These messages are often negative (消极的) or attack ads. Americans traditionally say they dislike negative ads, but political experts say these ads often work. In many cases, the candidates likely to gain from negative ads say that their own campaigns (活动) were not involved. Outside groups or national party committees often pay for these ads. Some are about issues, like a candidate’s position on the war in Iraq or immigration. But political ads increasingly seem to be attacking candidates personally. Some political watchers say this year’s election has brought more negative ads than ever before. Whether this is true remains to be proven. But some ads have made news, like a Republican National Committee ad against Harold Ford. The ad was based on the fact that last year he attended a Super Bowl party held by the men’s magazine Playboy. The ad showed an actress with bare shoulders saying she met him at the Play boy party. 'Harold, call me,' she says. The ad might have seemed humorous, except that the woman is white and Mr. Ford is black. 63. The underlined word 'some' in the fourth paragraph refers to ______. A. campaigns        B. Ads       C. groups or party committees       D. candidates 64. About political ads, the author ______. A. doesn’t show his own opinion B. thinks they are negative C. considers them fair D. disagrees with them 65. The author mainly discusses ______. A. American elections B. the ads campaign behind American elections C. negative ads in the US D. political advertising on TV