阅读短文，下列问题

Why do children like watching TV?

       Many children like watching TV. It's very interesting and they can see a lot and know many things about other people. They can learn from the radio, too. But they can learn easily from TV. Why? Because they can hear and watch at the same time. But they can't watch anything from the radio.

    TV helps to open children's mind. They can find better way to do things.

    Many children watch TV only on Saturday and Sunday evenings.They are very busy. But some children watch TV every night. They go to bed late. It's not good for their eyes and health.

下列词语中，划横线的字读音完全正确的一组是（    ）

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请阅读上述材料，运用所学知识回答下列问题：