Calvert Vaux, a British architect, asked Olmsted to collaborate with him on a park design, and Olmsted agreed.Vaux saw the park as a work of art, while Olmsted saw the park as a place for people to escape the noise of the city.Together they invented a plan that would give the persons and animals living in the city a quiet, green park and would also preserve and increase the good qualities of the natural features of the land.The commissioners voted in favor of Vaux and Olmsted's plan, and in 1858, the two became the official designers of New York City's Central Park.

　　It took cartloads of topsoil to build Central Park's gentle slopes, shady glens, and steep, rocky ravines.Five million trees were planted, a water­supply system was laid, and bridges, arches, roads and paths were constructed.The park officially opened in 1876, and today, well over a century later, people still escape the noise of the city in Olmsted and Vaux's great work of art.

　　16．What is the text mainly about?

　　A．A history of the planning of Central Park.

　　B．An engineering plan for Central Park.

　　C．A biography of Frederick Law Olmsted.

　　D．A guided walking tour of Central Park.

　　17．Olmsted became manager of Central Park because of________.

　　A．his friendship with Calvert Vaux

　　B．his hard work in clearing the land

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