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   A little girl went to a hospital. “I want to 1 a miracle(奇迹).” “What?” said the doctor. “My brother is badly ill, 2 my daddy says only a miracle can save my brother.” “We don’t sell miracles here, little girl. I’m 3 but I can't help you,” said the doctor. “I have the 4 to pay for it.” said the girl.
The doctor’s brother asked, “What miracle does your 5 need?” “I don't know,” she answered. “My daddy can't 6 for it, so I want to use my money.” “How much do you have?” asked the man. “A dollar and a half.” “Well,”7 the man, “a dollar and a half can buy a miracle.”
That man was a very good 8. The operation(手术) was free and her brother became well. “What's the price 9 the operation?” her mom asked. The little girl smiled. She knew exactly how 10 a miracle was—a dollar and a half with the faith(诚意) of a little girl.

下列图形中，∠1一定大于∠2的是（　　）

“一般不用K、Ca、Na等活泼金属来置换盐溶液中的其他金属元素”，这是教科书上的一句话。小科对此进行了思考，并查阅资料，对金属钠和硫酸铜溶液的反应进行探究。

【查阅资料】钠常温下就能与水发生剧烈反应，反应方程式为:2Na+2H₂O==2NaOH +H₂↑。

【提出猜想】猜想一:金属钠和硫酸铜溶液反应会有铜生成。

猜想二:金属钠和硫酸铜溶液反应，生成的沉淀只有氢氧化铜。

【实验及现象】切取不同大小的钠块分别投入到两种不同浓度的硫酸铜溶液中，有关产生沉淀的现象如下表所示。

小科咨询老师后得知蓝绿色沉淀为碱式铜盐。