[解析]
(1)D.主旨大意题。根据文章第一段关键句"For more than two hundred years,the White House has stood as a symbol of the United States Presidency,the U.S.government,and the American people."(两百多年来,白宫一直是美国总统、美国政府和美国人民的象征。)及最后一段关键句 "At various times in history,the White House has been known as the "President's Palace," the "President's House," and the "Executive Mansion.""(在不同的历史时期,白宫被称为"总统的宫殿"、"总统的房子"和"行政官邸"。)并结合全文内容可知,本文主要介绍了白宫的历史。故选D项。
(2)A.词义猜测题。根据文章第二段关键句"Thomas Jefferson held the first inaugural open house in 1805"(托马斯•杰斐逊在1805年举行了第一次总统就职开放日)及"Abraham Lincoln did the same,but then the inaugural crowds became far too large for the White House to accommodate comfortably,and this also created a security issue."(亚伯拉罕•林肯也做了同样的事,但随后就职典礼的人群变得太大,以至于白宫无法舒适地容纳,这也造成了安全问题。)并结合 "It was not until Grover Cleveland's first presidency that some effective crowd control measures were implemented to address the problem"(直到格罗弗•克利夫兰的第一任总统任期内,一些有效的人群控制措施才得以实施,以解决这个问题)可知,this practice指代总统举行就职开放日一事。故选A项。
(3)C.细节理解题。根据文章第一段关键句"In 1790,President George Washington declared that the federal government would reside in a district "not exceeding ten miles square …on the river Potomac." As preparations began,a competition was held to find a builder of the "President's House.""(1790年,乔治•华盛顿总统宣布联邦政府将设立在"波多马克河上不超过10平方英里的地区"。当准备工作开始时,举行了一场寻找"总统住宅"建造者的比赛。)可知,George Washington发起了白宫的建设。故选C项。
(4)B.细节理解题。根据文章第一段关键句"Nine proposals were submitted,and the Irish﹣born architect James Hoban won the gold medal for his practical and handsome design."(共有9个提交方案,爱尔兰建筑师詹姆斯•霍班以其实用和美观的设计赢得了金牌。)可知,白宫的设计者是一位爱尔兰建筑师,不是一位美国总统。故选B项。