题目

There is difference between reading for information and reading for understanding.   36  The first sense is the one in which we read newspapers, magazines, or anything else.    37   Such materials may increase our store of information, but they cannot improve our understanding. And clearly we don't have any difficulty in gaining the new information, for our understanding was equal to them before we started. Otherwise, we would have felt the shock of puzzlement. The second sense is the one in which we read something that at first we do not completely understand. Here the thing to如图所示的程序是用来（　　）  A、计算3×10的值B、计算39值C、计算310的值D、计算1×2×3×…×10的值