单项选择题

Further steps are needed in the COP21 agreement to lock……

Further steps are needed in the COP21 agreement to lock in the 2°C vision more strongly so that it anchors future expectations.
A、secures
B、achieves
C、locks in

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单项选择题一般软弃当前操作的命令键是（）。

单项选择题下面正确创建了二维交错数组的是()。

A．int[][] Arr=new int[3][]; Arr[0]=new int[]{10,20,30}; Arr[1]=new int[]{40,50,60,70}; Arr[2]=new int[]{80,90};
B．int[,] Arr=new int[3,]; Arr[0]=new int[]{10,20,30}; Arr[1]=new int[]{40,50,60,70}; Arr[2]=new int[]{80,90};
C．int[][3] Arr={new int[]{10,20,30},new int[]{40,50,60,70},new int[]{80,90}};
D．int[3][] Arr={new int[3]{10,20,30},new int[4]{40,50,60,70},new int[2]{80,90}};