A. became very sad

　　B. made up his mind to get married

　　C. thought that nothing in life was worth doing

　　D. began to see his life in a different way

　　C

　　Using a mobile phone before going to bed can damage your health, according to a major study.

　　It says that radiation from the mobile phone can cause insomnia (失眠症) and headaches as well as cutting the time spent in deep sleep. Failing to get enough sleep can lead to sadness and hopelessness, lack of attention and personality changes. In teenagers and young children, lack of sleep can lead to attention disorders and poor grades.

　　The research showed that using mobile phones before bed causes people to take longer to reach the deeper stages of sleep and to spend less time in them.

　　Deep sleep is important as it is the time when the body rejuvenates (更新) cells and repairs damage suffered during the day. Scientists found that using mobile phones an hour before sleep affects it. In the study scientists examined the sleep patterns of 35 women and 35 men aged 18 to 45. Some were exposed to (暴露于) radiation that is similar to what a person receives when using a mobile phone. The others received none. The results are as follows: The first group took longer to enter the first of the deeper stages of sleep and spent less time in the deepest one. However, the second group was opposite.

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