题目

第三部分 阅读理解 (共15小题；每小题2分，满分30分) 请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。 When Paul was a boy growing up in Utah, he happened to live near a copper smelter(炼铜厂), and the chemicals that poured out had made a wasteland out of what used to be a beautiful forest. One day a young visitor looked at this wasteland and called it an awful area. Paul knocked him down. From then on, something happened inside him. Years later Paul was back in the area, and he 7．3个小朋友互相通一次电话，一共要通3次电话；4个小朋友，每两人互相通一次电话，一共要通6次电话．