在一次化学实验中，同学们将饱和硫酸铜溶液逐滴加到5mL饱和氢氧化钠溶液中，观察到以下异常实验现象：

实验序号	滴加硫酸铜溶液的量	实验现象
①	第1﹣6滴	产生蓝色沉淀，但振荡后沉淀消失，形成亮蓝色溶液
②	第7﹣9滴	产生蓝色沉淀，且沉淀逐渐增多．振荡后沉淀不消失，很快沉淀逐渐变黑色

阅读短文并选择
    Miss Lee is 21 years old. She likes students and her work. From Monday to Friday she stays at school and gives the students lessons. She has much work to do, but she often plays games with her students after school. On Sundays, she drives to her parents' home and stays with them. Sometimes she goes to see her friends on Sundays. She drives back to school on Monday morning. She's a good girl.

填上合适的数字．

在横线上写出下面的句子用了什么修辞手法。

①天上的星星怕冷似的钻进了云絮里。____

②见了久别的亲人，他的眼泪像断了线的珠子往下落。____

③遵守交通规则，不是我们应该做的吗？____

④这场雨流进了麦田，流进了果园，流进了人们的心里。____

找出下列单词中不同类的一项（   ）