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阐述感觉产生的基本过程。

答案

参考答案:

由刺激物直接作用于某种感觉而产生感觉。感觉产生的第一个基本过程是通过觉察光、声、气味等各部分不同形式的刺激能量来收集信息。感觉产生的第二个基本过程是信息转换,即把进入到感觉器官的能量转换为可以传递的神经冲动,是感觉活动的关键环节,其生理机构为感受器,不同感受器只对某一种特定形成的能量发生反应与能量互换。感觉产生的第三个基本过程是将感受器传出的神经冲动经过特异性传入神经的传导,将信息传到大脑皮质的相应中枢部位,产生特定的感觉,比如颞叶是听觉的中枢;枕叶是视觉的中枢等

阅读理解

Frederick Law Olmsted (1822 - 1903), a Connecticut farm boy, saw his first public park in Liverpool, England, as he accompanied his brother on a walking tour. He was impressed by the park’s winding paths, open fields, lakes and bridges. Perhaps the most wonderful things of all was that the park was open to everyone.

A moment beginning in 1840 to set aside park land on New York City’s Manhattan Island has successful result in 1856 with the purchase of 840 acres of rocky and swampy (沼泽) land, bought with about $ 5 million in state funds. Olmsted’s chance meeting with a project organizer led to his applying for the job of park manager. In 1857 Olmsted was appointed manager of the proposed park, and the clearing of the site began.

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 millions of cartloads of topsoil to build Central park’s gentle slopes, shady glens, and steep, rocky ravines. Five million trees were planted, a water – supply 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.

53.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.

54.Olmsted became manager of Central Park because of         .

A.his friendship with Calvert Vaux

B.his hard work in clearing the land

C.his winning a design competition

D.a chance meeting with one of the park’s organizers

55.The underlined word “collaborate” in the third paragraph means         .

A.disagree    B.comment   C.vote   D.work together

56.Which of the following is true about Central Park?

A.It is out of date nowadays.       

B.The designers came from the same country.

C.It is an old park in America.      

D.It is only for people who can well afford it.

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