根据密度公式ρ=，下列说法正确的是（    ）

增加：在缺词处加一个漏字符号（^），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：每处错误及其修改均仅限一词。

只允许修改10处，多者（从第11处起）不计分。

    My friend Nick told me story about his experience back in the US, that was very interested. One day he was having a yard sale and the old man living next door come by to help. As the old man looked over the things in the yard that was to be sold, he stopped at a box of golden ball for Christmas trees. On the box was a card say, “25 cents each.” “You will never sell these for that much.” he told Nick. Convincing, Nick has brought the price up to 10 cents a piece. Without a moment's delay, my neighbor picked up the box but announced, “I'll take them.”

读下面的中国地形图，回答下列问题。