增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

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：10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。

    It was cloudy day with little rain in the air. I stood at the roadside waiting for a taxi while suddenly I felt a voice beside me. It was a boy who was wearing poor cloth. I felt very disgusted that I tried to pull myself away. The boy kept follow me shouting out "Big brother! Big brother!" and I didn't answer him at all. I heard him call out again, which makes me angry. So I shouted at him that we had no money to spare. However, the boy said to me, "Brother, will you please to help me cross the road?" I held the boy's hand firm and helped him cross the road.

下列哪一项不是我国土地资源开发利用中的主要问题（　　）