有甲、乙两位同学根据所学化学知识，设计了由铜和硫酸为原料制取硫酸铜的两种方案：

①铜与浓硫酸加热直接反应，即Cu→CuSO₄

②将铜加到热的稀硫酸中并通入空气来制备硫酸铜，即由Cu→CuO→CuSO₄，试回答：

(1)、写出方案①的化学反应方程式                                        这两种方案，你认为哪一种方案比较合理?        。(答编号)，理由是                                                                      

(2)、实验室采用方案①取6.4 g铜片和10 mL 18 mol/L^－1浓硫酸，放在试管中共热时发现，铜与热的浓硫酸反应后并没有得到预期的蓝色溶液，而是在试管底部看到灰白色沉淀。甲、乙两位同学为了验证其中灰白色沉淀的主要成分，设计下列实验：实验步骤：倾倒掉上层液体后，向所得灰白色的固体中加入适量蒸馏水，边加边搅拌

实验现象：_____________________________________________

实验结论：所得灰白色固体的化学式为_    _______直到最后反应完毕，发现试管中还有铜片剩余。可两位同学仍然认为试管中还有硫酸剩余，他们这样认为的理由是___________                      _____

Libraries form a vital part of the world’s systems of communication and education.
They make available knowledge accumulated through the ages. People in all walks of life use library resources in their work. People also turn to libraries to satisfy a desire for knowledge or to obtain material for leisure-time activity. In addition, many people enjoy book discussions, concerts, film programs, lectures, story hours, and a variety of other activities provided by libraries. Libraries also play an important role in preserving a society’s cultural heritage(遗产). The library ranks as one of society’s most useful service institutions.
The contents of libraries have changed so much through the years that the word library itself is, in a sense, inaccurate. The word comes from the Latin word liber, which means book. Today’s libraries house many books, of course. However, they also have a wide variety of other materials that communicate, educate, and entertain. These materials include magazines, manuscripts (手稿), newspapers, and computer documents.
Audio and visual materials include CDs, audiocassette tapes, videotapes, films, maps, paintings, and photographs.
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The expansion of library contents greatly increases the library’s ability to communicate and educate. For example, people interested in classical music can listen to CDs and read books on the topic. Students of agriculture can read magazines and watch videotapes on farming methods. Many people use magazines and newspapers to find the most up-to-date material on current events.
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