［A］ New plants and animals then move into the area and begin to grow.

［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels.

［C］ On a smaller scale, large mammals, such as elephants, regularly destroy rain forest vegetation in the Congo River Basin in Africa.

［D］ An understory of shorter trees and a lacework of woody vines, or lianas, produce a forest of such complex internal architecture that many animals, including some sizable ones, rarely or never descend to the ground.

［E］ Less than one percent of the trees in the forest reside in the canopy and emergent layers.

［F］ Because more light penetrates the canopy, however, the vegetation of the understory and forest floor is better developed than in the tropics.

［G］ The rich, green canopy is teeming with life, and forest researchers have developed ingenious methods for accessing this mysterious ecosystem.

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[主观题]int[][] myarray3=new int[3][]{new int[3]{5,6,2},new int[5]{6,9,7,8,3},newint[2]{3,2}};myarray3[2][2]的值是（ ）。

[主观题]int[][] myarray3=new int[3][]{new int[3]{5,6,2},new int[5]{6,9,7,8,3},newint[2]{3,2}};myarray3[2][2]的值是（ ）。

[主观题]程序片断如下：int i = 4;int a[] = new int[5];while(i>=0){a[i] = i;}for(int j=0; j<=a.length; j++){System.out.println(a[j]);}请问当该程序片断被运行时，是否会出现错误？如果没有，输出结果是什么？如果有错误，请指出错误并改正。

[主观题]程序片断如下：int i = 4;int a[] = new int[5];while(i>=0){a[i] = i;}for(int j=0; j<=a.length; j++){System.out.println(a[j]);}请问当该程序片断被运行时，是否会出现错误？如果没有，输出结果是什么？如果有错误，请指出错误并改正。

[单选题]（ 31 ）若数组 a 定义为 int[][]a=new int[3][4] ，则 a 是A． ）一维数组B． ）二维数组C． ）三维数组D． ）四维数组

[单选题]若数组a定义为int[][]a=new int[3][4]，则a是A．一维数组B．二维数组C．三维数组D．四维数组