The findings will shock many parents. Many parents are always worried about their children’s health. But they didn’t have a better way to persuade them not to use a mobile phone.

　　28. The passage mainly tells us that ________.

　　A. deep sleep is good for your health

　　B. different people have different sleep patterns

　　C. long sleep can renew cells

　　D. using a mobile phone before sleep can damage your health

　　29. The underlined word “ it” refers to ________.

　　A. people’s body

　　B. a sleep pattern

　　C. deep sleep

　　D. a day

　　30. Which of the following is NOT mentioned in the passage?

　　A. The findings shocked many teachers and teenagers.

　　B. Deep sleep is a good time for the body to repair damage suffered during the day

　　C. The study examined the sleep patterns of 70 people.

　　D. Using mobile phones before bed causes people to take longer time to enter the deep sleep.

　　31. We can infer from the passage that _________.

　　A. the lack of sleep can lead to children’s excitement

　　B. many children use mobile phones before sleep

　　C. radiation from the mobile phone can cause parents’ worries

　　D. using a mobile phone before sleep doesn’t harm the aged

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