A Brown University sleep researcher has some advice for people who run high schools: Don’t start classes so early in the morning. It may not be that the students who nod off at their desks are lazy. And it may not be that their parents have failed to enforce(确保) bedtime. Instead, it may be that biologically(生物学上)these sleepyhead(贪睡者)students aren’t used to the early hour.
　　“Maybe these kids are being asked to rise at the wrong time for their bodies,” says Mary Carskadon, a professor looking at problem of adolescent (青春期的)sleep at Brown’s School of Medicine.
　　Carskadon is trying to understand more about the effects of early school time in adolescents. And, at a more basic level, she and her team are trying to learn more about how the biological changes of adolescence affect sleep needs and patterns(方式).
　　Carskadon says her work suggests that adolescents may need more sleep than they did at childhood, no less, as commonly thought.
　　Sleep patterns change during adolescence, as any parent of an adolescent can prove. Most adolescents prefer to stay up later at night and sleep later in the morning. But it’s not just a matter of choice---their bodies are going through a change of sleep patterns.
　　All of this makes the transfer(迁移)from middle school to high school---which may start one hour earlier in the morning----all the more difficult, Carskadon says. With their increased need for sleep and their biological clocks set on the “sleep late, rise late” pattern, adolescents are up against difficulties when they try to be up by 5 or 6 a.m. for a 7:30 a.m. first bell. A short sleep on a desktop may be their body’s way of saying. “I need a timeout.”
【小题1】Carskadon suggests that high schools should not start classes so early in the morning because _______.

   Nowadays, Internet becomes much easier for people to use. More and more people like to      on the Internet. How can you protect yourself from different types of Internet tricks? Following ideas can make your online shopping        .
Never click on an unsolicited (主动提供的) email. If you are        in the things, some well-known companies sell the same things. Don’t          on any website address in the email itself.
Don’t          any email that asks you for personal financial (财务的) information. Most of the legitimate (合法的) companies will not ask for your information through emails. And don’t believe what the email says        . Sometimes some emails will ask you to make a telephone call to get more information about the thing you want. When you meet this, don’t forget        the phone number on your phonebook to make sure it is the number of a legitimate company before you make the call.
When you are          information on the Internet, make sure that there is a key symbol        the bottom of your browser (浏览器) and the “https://” is in the website address. These mean that the website is safe.
Don’t send your money to an unknown website before you          the things they send to you and make sure they work well.
Shopping on the Internet is easy and fun. It is also safe if you are careful enough.