读下面四幅图

图一中，主要牧区与主要种植业区的分界线是（　　）

下列动物中精子与卵细胞在水中受精的是（　　）

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。

    Friendship is important. Everyone need friendship. In all our lives we can't live without friendship just like we can't live without air and water. Friendship makes us get along well one another to go ahead under all kinds of difficulties in the front of us. But real friendship is not easy come by. True friendship must be sincere and be based on understand each other but not on the benefits from each other. A good friend can always be good teacher to us. He or she gives us some good advices on how to do things. So the more friends have, the better we can improve ourselves.