问题 单项选择题

下列关于栈的描述正确的是( )。

A.在栈中只能插入元素而不能删除元素

B.在栈中只能删除元素而不能插入元素

C.栈是特殊的线性表,只能在一端插入或删除元素

D.栈是特殊的线性表,只能在一端插入元素,而在另一端删除元素

答案

参考答案:C

解析: 根据数据结构对栈的定义及其特点可知:栈是限定只在表尾进行插入或删除操作的线性表,因此栈是先进后出的线性表,对栈的插入与删除操作,不需要改变栈底元素。栈是限定只在表尾进行插入或删除操作的线性表。

单项选择题
阅读理解

Glacier National Park in Montana shares boundaries with Canada, an American Indian reservation, and a national forest. Along the North Fork of the Flathead River, the park also borders about 17,000 acres of private lands that are currently used for ranching, timber, and agriculture. This land is an important part of the habitat and migratory routes for several endangered species that frequent the park. These private lands are essentially the only ones available for development in the region.

With encouragement from the park, local landowners initiated a landuse planning effort to guide the future of the North Fork. The park is a partner in an interlocal agreement that calls for resourcemanaging agencies to work together and with the more than 400 private owners in the area. A draft plan has been prepared, with objective of maintaining traditional economic uses but limiting new development that would damage park resources. Voluntary action by landowners, in cooperation with the park and the county, is helping to restrict smalllot subdivisions, maintain wildlife corridors, and minimize any harmful impact on the environment.

The willingness of local landowners to participate in this protection effort may have been stimulated by concerns that congress would impose a legislative solution. Nevertheless, many local residents want to retain the existing character of the area. Meetings between park officials and landowners have led to a dramatically improved understanding of all concerns.

73. The passage mainly discusses ______.

A. the endangered species in Glacier National Park

B. the protection of lands surrounding Glacier National Park

C. conservation laws imposed by the state of Montana

D. conservation laws imposed by Congress 

74. Why are the private lands surrounding Glacier National Park so important?

A. They function as a hunting preserve.B. They are restricted to government use.

C. They are heavily populated. 

D. They contain natural habitats of threatened species. 

75. The relationship between park officials and neighboring landowners may best be    described as ______.

A. indifferent                      B. intimate C. cooperative               D. disappointing

76. It can be inferred from the passage that a major interest of the officials of Glacier     National Park is to ______.

A. limit land development around the park       B. establish a new park in Montana

C. influence national legislation           D. settle border disputes with Canada 