阅读理解

　　It is reported that many middle school students are just not getting enough sleep, especially during the school week．The problem seems to get worse as they get older．Year 7 students sleep 8.4 hours in a school night, and Year 9 students only 6.9 hours．

　　It's also reported that not getting enough sleep can cause problems in a student's life．

　　Many students fall asleep in school or while doing their homework, so it is not surprising that they get lower grades than those who get enough sleep．Scientists suggest nine hours a night for middle school students．

　　Of the students who feel unhappy and nervous, 73％do't get enough sleep at night．

　　Why aren't students getting enough sleep? Many students have one of the following things, like telephone, television, or computer, in their bedrooms．Using them on a school night not only takes their time away from homework, but also makes it difficult for them to fall asleep．As a result, many students can't fall asleep before 11 P.m., yet they must get up early to go to school．

　　Scientists also suggest students should not do exciting activities for an hour before bedtime．

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　　Each morning, I walked past a security guard(保安)。He 　　1　　 everyone that walked by him．I 　　2　　 how he knew so many people by their first names．The first few times I saw him．I didn’t say hello back to him 　　3　　 he greeted me．I was lost in my own world．On Monday he asked,“How was your 　　4　　?”I told him about my visit to my sick, elderly mother．He told me how 　　5　　 he was for my mother’s sickness．As I walked away, I realized I did not even know his 　　6　　．The following day, I asked,“What’s your name?”He answered,“Gary．”I said,“I’m Deborah．”After that, we talked a couple of times a week．We 　　7　　 stories about our weekends, our dreams, and our families．Gary got offered a new job and moved 　　8　　．It has been years since I last spoke to him, yet the memory feels like yesterday．

　　I look back at what became a friendship of sharing stories from the heart．When you say 　　9　　 to a stranger(陌生人)you become a pebble(鹅卵石)thrown into a lake．With each ripple(涟漪)you create, you spread 　　10　　 that continues to give．

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阅读理解

　　First it was an earthquake．Then came a terrible tsunami．These natural disasters killed thousands of people in Japan on Mar．11, 2011．Then a nuclear crisis(核危机)put the island in danger and shocked the world．

　　Damaged by the earthquake and tsunami, Fukushima Daiichi nuclear plant(福岛第一核电站)has put out dangerous radioactive(放射性的)materials．Experts from several countries are working to control the crisis．

　　Although the reports say the leak so far will not cause huge health problems, people are worrying about nuclear safety．Switzerland has stopped plans to build new nuclear plants．Germany raised questions about its nuclear future．

　　As for China, the government has suspended approving(暂停审批)new nuclear power stations and stepped up safety checks at existing plants, Xinhua reported．But it is reported that all nuclear power stations in China are safe．

　　A nuclear power plant creates electricity．It is a clean energy source．In 1954, the world's first nuclear power plant was built in Russia．From then on, nuclear power has been widely used．

　　But nuclear power plants have hidden problems．If radioactive materials get into the air or water, they can pollute soil and plants and harm humans and animals．Nuclear accidents, such as the Chernobyl(切尔诺贝利)disaster in 1986 in the Ukraine, have caused great damage to the nearby people and the environment．

　　Will there be another choice for energy that we can use in the future? In recent years, scientists have found ways to make electricity from sunshine, wind and garbage．

　　Some scientists say hydrogen(氢气)may be used to create power．Hydrogen is a clean resource to use, and will never disappear．Some car companies have already developed cars powered by hydrogen．But still, the technology for its production is only in early stages of development．

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