从A、B、C三个选项中，选择可以填入空白处的最佳答案。

    Whitney didn't have many friends. She was shy and 1. She never wanted to be popular, but she did want to have someone to share 2 and laugh with.

    Then it was time for her to go to college in another town. And she had to 3 with someone she didn't know. She had no idea whether she could make friends in that new environment.

    But something happened during the first class. And it 4Whitney's life. The teacher asked everyone to 5 a little about themselves. Whitney told everyone where she came from and some simple information. The last 6 for each student was "What is your goal for this term?" 7 of the students said it was to get good grades, pass the tests or something similar. But Whitney said something 8 . She said that her goal was to make just one good friend.

    When most of the students sat quietly, one student came to Whitney. She reached out her hand and introduced herself. She asked 9 she could be Whitney's friend. Whitney was surprised and happy. She 10 and reached her hand out, too.

    Their friendship lasted all through the college.

已知在平面直角坐标系中有三点A（﹣2，1）、B（3，1）、

C（2，3）．请回答如下问题：

    据科学家研究，黄河发生变化有两方面的原因。一是自秦朝以后，黄土高原气温转寒，暴雨集中。加上黄土本身结构松散，很容易受侵蚀而崩塌，助长了水土流失，使大量泥沙进入黄河。二是人口迅速增长，无限制地开垦放牧，使森林毁灭，草原破坏，绿色的植被遭到严重破坏，黄土高原失去天然的保护层，引起了严重的水土流失。每年，黄河流域每平方公里就有4000吨宝贵的土壤被侵蚀掉，相当于一年破坏耕地550万亩！更严重的是，水土流失使土壤的肥力显著下降，造成农作物大量减产。越是减产，人们就越要多开垦荒地；越多垦荒，水土流失就越严重。这样越垦越穷，越穷越垦，黄河中的泥沙也就越来越多，因而黄河决口、改道的次数也就越来越频繁。