题目

Daniel Anderson, a famous psychologist, believes it’s important to distinguish television’s influences on children from those of the family. We tend to blame TV, he says, for problems it doesn’t really cause, overlooking our own roles in shaping children’s minds. One traditional belief about television is that it reduces a child’s ability to think and to understand the world. While watching TV, children do not merely absorb words and images (影像). Instead, they learn both explicit(明确的) and hidden meanings from what they see. Actually, children learn early the psycho 下图是表示气体微粒的示意图，图中“●”和“○”，分别表示不同元素的原子，其中表示纯净物的是 （     ）