画出“维恩图”.三个圆α、β、γ分别表示这些居民使用电视、收音机和报纸.而a、b、c、d、e、f、g、h是表示这些居民的各种子集.如a表示不使用任何传播新闻工具的人,b表示用电视但不用收音机和报纸的人.e表示用电视和收音机而不用报纸的人,等等. 从维恩图中我们可以看到 Draw the “Venn diagram.” The three circles α, β, γ indicate that these residents use TV, radio and newspapers respectively. And a, b, c, d, e, f, g, h mean that these residents Subsets. If a means not to use anybody who spreads news tools, b means to use television but not to use radio and newspapers. E means to use TV and radio instead of newspapers, etc. From the Venn diagram we can see To