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A study into children's television viewing habits reveals that children whose parents have a high level of education tend to watch less television than children from less educated family backgrounds .The report also suggests that a high rate of TV watching among children in poorer suburban areas and in the provinces, compared to those living in large urban centres, is often due to poverty and a lack of other kinds of entertainment in the area. Disco, cinema, theatre and sports activities offer children in urban centres a wider range of pastimes,which leads to far fewer hours being spent in front of the box. Commercials,comedies and adventure films are children's favourite programmes, while twenty per cent of children said they preferred violent films and thrillers.

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c. Khí oxi thu được ở trên có đủ tác dụng hết với 33.6g sắt không