[简答]    （1）对关键字序列(56,51,71,54,46,106),利用快速排序，以第一个关键字为分割元素，经过一次划分后结果为；    A. 46,51,56,54,71,106       B. 56,51,54,46,71,106      C. 46,51,54,56,71,106              D.56,51,46,54,71,106  （2）一组记录的关键字序列为（60,47，80，57，39，41，46,30），利用归并排序的方法,经过(2,2)归并的结果序列为。.   A.(30, 57,60,80,47,39,41,46 )    B.(47,60,57,80,30,39,41,46 )   C.(41,57,60,80,30,39,47,46 )       D.(47,57,60,80,30,39,41,46 )