一个mxn的数组包含______行、_______列、________个元素。
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数组a1的4个元素名字分别是______、_______、_________和_________。
已知int[][] a= {{1,2},{3,4,5,6},{7,8,9}}，a.length()=_________，a[0].length()=__________, a[1].length()=__________,a[2].length()=__________,a[3].length()=__________。
What's the features of ad slogans?
A. use of adjectives
B. use of interrogative sentences
C. use of imperative sentences
D. use of pun
E. use of simple sentences
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