题目

某兴趣小组在做完碳还原氧化铜试验后，进行了如图的探究 （1） 【猜想】把氧化铜还原成铜的物质是：Ⅰ石墨；Ⅱ． （2） 【实验】用天平称量1.5g氧化铜粉末，直接用铝箔纸包裹．按上述操作步骤实验，黑色粉末，那么猜想Ⅱ不成立． （3） 【实验】石墨棒能使氧化铜还原成铜，该反应的化学方程式为 （4） 【改进】把石墨棒换成铝粉重复上述操作，又获成功．那么称取等量的铝粉并进行同样的操作，其目的是．改进后的实 CinderellaOnce upon a time, there lived an unhappy young girl. She was unhappy, for her mother died several years ago, and her father married (结婚) another woman. The woman had two daughters. They were her stepsisters (异父/母之姐妹)now. Her new mother didn’t like her. All the nice dresses, shoes, delicious food, kind thoughts and care were for her own daughters.For the poor unhappy girl, there was nothing at all. No dresses, only her stepsisters’ hand-me-downs（别人用过的旧东西）. No lovely dishes and no nice rests. For she had to work hard all day, and only when evening came, she could sit for a while by the fire, near the cinders (煤渣,炉渣). That is how she got her nickname-Cinderella.小题1: All the good things were for _________.A．Cinderella herselfB．her fatherC．her new motherD．her stepsisters小题2: What did Cinderella do all day?A．She worked hard.B．She felt sad.C．She cooked meals.D．She enjoyed eating.小题3: Cinderella could have a rest only _________.A．in the morningB．in the afternoonC．in the eveningD．after lunch小题4:People called her Cinderella because_________.A．she lost her mother long agoB．she did not have nice thingsC．she looked very prettyD．she sat by the cinders sometimes