This is a photo of my family . I'm John . I'm ten . My sister is seven . We are in the same school .My grandparents are Americans . My father is 42 .He is a driver . My mother is 40 . She is a teacher . We are very happy .
请根据图中显微镜的结构,回答:当①脏了,可用来擦拭的是( )
函数y=1x的自变量x的取值范围是 ____