单选题：To sort array $$M$$ with $$n$$ elements by 2-way merge sort, the
To sort array $$M$$ with $$n$$ elements by 2-way merge sort, the function **2-way merge** is to
A.merge two sorted sublists into one sorted list.
B.divide $$M$$ into two roughly equal-sized parts.
C.divide $$M$$ into $$n$$ parts, where each part contains one element.
D.divide $$M$$ into two parts, where all the elements in one part are smaller than those of the other part.
答案：A
A.merge two sorted sublists into one sorted list.
B.divide $$M$$ into two roughly equal-sized parts.
C.divide $$M$$ into $$n$$ parts, where each part contains one element.
D.divide $$M$$ into two parts, where all the elements in one part are smaller than those of the other part.
答案：A
