题目内容

Listen to a passage about The Great Plague of London and fill in the blanks.The Great Plague of London (1664 — 1666) was an_______(1)of bubonic (鼠疫) plague that ___________(2)London and was particularly violent during the hot months of August and September of 1665. In one week, 7,165 people died of the plague. The total number of deaths was about 70,000 of a total population __________(3)at 460,000. The disease was carried by _________(4)that lived on black rats. It was generally_____________(5), and its effects were terrible — fever and __________(6), swelling of the lymph glands, eventual ____________(7)and death. Most of the______________(8)was in the city’s outskirts, in areas where the poor were densely crowded. Those who could, including most doctors, lawyers and ____________(9), fled the city. All trade with London and other plague towns was stopped, but from 1667 only sporadic cases appeared until 1679. The plague’s decline was___________(10)to various causes, including the Great Fire of London.

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[2009 统考真题]下列关于无向连通图特性的叙述中,正确的是( )。 I.所有顶点的度之和为偶数 II. 边数大于顶点个数减1 III.至少有一个顶点的度为1

A. 只有I
B. 只有II
C. I和II
D. I和III

下列哪种图的邻接矩阵是对称矩阵?()

A. 有向网
B. 无向网
C. AOV网
D. AOE网

对一个有n个顶点、e条边的图采用邻接表表示时,进行DFS遍历的时间复杂度为( ),空间复杂度为( ); 进行BFS遍历的时间复杂度为( ),空间复杂度为( ).

A. O(n^2)
B. O(e)
C. O(n+e)
D. O(1)

用Prim算法和Kruskal算法构造图的最小生成树,所得到的最小生成树( ).

A. 相同
B. 不相同
C. 可能相同,可能不同
D. 无法比较

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