2011新托福阅读相关背景知识9

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District of Columbia, a smaller area was laid out as the city of Washington. (In 1846, one-third of the District was retroceded by Congressional action to Virginia, thus removing that portion of the original district which lay west of the Potomac River.) In March 1791,the surveyors' roles were complemented by the employment of Major Pierre Charles L'Enfant to prepare the plan. 　　Major L'Enfant (1755-1825), a French artist and engineer who had formed a friendship with George Washington while serving in the Revolutionary War, requested the honor of designing a plan for the national capital. The fact that the area was largely undeveloped gave the city's founders the unique opportunity to create an entirely new capital city.
　　After surveying the site, L'Enfant developed a Baroque plan that features ceremonial spaces and grand radial avenues, while respecting natural contours of the land. The result was a system of intersecting diagonal avenues superimposed over a grid system. The avenues radiated from the two most significant building sites that were to be occupied by houses for Congress and the President.
　　L'Enfant specified in notes accompanying the plan that these avenues were to be wide, grand, lined with trees, and situated in a manner that would visually connect