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：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

    Jack failed in the history examination in the end of the school term. And then he was telling that he would never graduate. However, her father went to see the professor and said, “He's a good boy. If you let him to pass this time, I'm sure he'll pass history examination next year.” “No, that's possible,” replied the professor immediate, “I asked him when Napoleon died. He didn't know!” “Please, sir, give him another chances. None of us knew Napoleon was ill so I didn't take any newspapers in my house,” answers Jack's father.

如果x＜y＜﹣1，那么代数式$\frac{y+1}{x+1}-\frac{y}{x}$的值是（　　）

读某海域表层年平均等温线分布图，完成下列各题。

已知方程x²+（k－1）x－3=0的一个根为1，则k的值为____ 。