some students are lack of the first class they take their vacations. [ ]A. because of B. as C. before D. and 题目和参考答案——青夏教育精英家教网—

                         UK students get more morrung rest
    You get lost in the forest, and then you walk forward and fall over.
Opening your eyes, you find yoursclfin a swimming pool full of chocolate.
Just when you're about to enjoy the chocolate,a voice shouls,“CET UP!!"
    This isn't some boot camp（新兵训练营）．It's the wake-up call that
every teenager in the UK goes through each morning.  Sleeping late is their
dream, but they have to get up and go to school early in themorning.
    Now,one school finally understands that asking teenagers to amve at
school at 9:00 a.m. is not just unfair but can also hurt both kids and their
studies.
    The Monkseaton High School in England recently decided to see whether
there was any diffrence they started their school day one hour later, at 10:00 am instead of'9:00 am.
    The results have been surprising. Since the later start, 28 percent fewer
students have been absent,seven percent fewer have been late. Best of all,
students get higher test scores. One stude.nt, Emelye Hood, 13, said, "When
I get more sleep,I can focus(集中精力）more on my lessons.”
    In trying the experiment（试验）,the school used studies by Oxford
scientist Russell Foster,a neuroscientist（神经系统学专家）．He says
that teenagers have different sleep cycles（周期）than adults.Adults are
active and ready for the day at 8:00 am, while teenagers aren't fully awake
until 10:00 am.
    Ryan Thompson, 13, also welcomes the later start. He says, "Now I get
to sleep and don't rush breakfast. It makes me much happier to go to
school.”

(     )1. The teenagers in the UK usually don't have enough time to sleep.
(     )2. One school in the UK has realized that it's good for kids to get more
sleep.
(    )3. The students can pay more attention to their studies if they get enough sleep.
(     )4. The teenagers can get ready for the day earlier than the adults.
(     )5.Many teenagers feel happy about the later start because they don't need to go to school in a hurry.

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