根据短文内容，选择正确答案。

    Mike had a nice blue cup which he liked best. It was a present from his aunt for his fifteenth birthday last year. He cleaned it once a day and took good care of it. His cat, Mimi, was very naughty(淘气的) and sometimes it could make some trouble(麻烦) for Mike.

    The day before yesterday, the cup was broken(打破) by his cat. He felt unhappy. Susan saw him and asked, "You look sad. What's the matter with you?"

    Mike said, "There is something wrong with my cup."

    Susan said, "Don't worry. I can repair it."

    Mike felt surprised and asked, "Repair? You can repair it? You?"

    "Yes. Believe me! Where is it?" Susan answered.

     "Here. My cup is broken. Are you sure you can repair it?" Mike took out his broken cup.

     "Ha……, I made a mistake(错误). I think your__1__ is broken," Susan said.

    Hearing what Susan said, Mike couldn't help laughing.

 分析处理图表中的信息是学习化学的一种重要方法．

（1）如表是氯化钠和碳酸钠在不同温度时的溶解度，根据此表回答：

①40℃时，氯化钠的溶解度为 ____g．

②碳酸钠的溶解度随温度的升高而 ____（填“增大”或“减小”）．在20℃时，将100g的水加入30g碳酸钠中，充分搅拌后得到的是 ____（填“饱和溶液”或“不饱和溶液”），将上述溶液升温到30℃，该溶液的溶质质量分数为 ____（计算结果精确到0.1%）．

③10℃时，分别配制表中两种物质的饱和溶液，其中溶质质量分数较小的物质是 ____．

（2）将足量的稀盐酸加入一定量的铁、铜混合物中，写出其中反应的化学方程式 ____．如图是实验过程生成气体或剩余固体的质量随反应时间的变化关系，其中表示正确的是 ____（填标号）．

非洲最高峰乞力马扎罗山海拔5859米，山顶气温比同纬度海拔900米处气温约低（     ）