用显微镜观察草履虫时，经常在临时装片的培养液中放一些棉丝，其作用是

阅读下列短文，根据短文内容填写表格。(每空限填一词)     

    Hi! Do you know the three children? They are in a happy family. Xiao Xue is a helpful girl. She is beautiful. She likes studying. She studies very hard. She gets up early and finishes her breakfast quickly .Then she rides her bike to school . Liu Xing is a little lazy. He gets up late and then washes his face, brushes his teeth in a hurry. Then he goes to the bus stop without breakfast. He usually plays basketball after school. In the evening, he seldom (很少)does homework. He goes to bed late. Xiao Yu is a lovely boy. He gets up very slowly and then he usually takes a shower(淋浴)at home before breakfast. After that, he goes to school in his father’s car. He likes watching TV in the evening.

元素电负性随原子序数的递增而增强的是（）

生物能够表现出非生物所不具有的生命现象．下列古诗描述的现象中，不包含生命现象的是（    ）