Usually, early risers have been praised as hard-working while those who prefer to get up late are considered lazy. Most people believe the early bird catches the worm.

　　　Yet some scientists now believe "night owls" can really focus(集中) longer and produce more than early risers.

　　　Research has found that the early bird does not always get the worm. In a Belgian study, both "morning people" and "evening people" were watched during their normal asleep and awake routines(常规)．After 10 hours of being awake, the "evening people" became more alert(思维敏捷的). However, the "morning people" became sleepy and less focused. Researchers believe the reason for this difference is that night owls receive a last-minute increase from their brains. This added energy allows them to stay alert for longer periods of time.

　　　Environment, lifestyle, activities and childhood routines all may have an effect on sleeping habits, yet genetics(遗传学)may play the biggest role.

　　　It is possible to change your sleeping habits through regular bedtimes, early exercise and by avoiding midnight snacks. But if you're happy rising early or staying up late, you're probably doing what works best for your own personal body clock.

　　　12．The author introduces the subject by ________.

　　　A． telling an interesting story

　　　B． giving different opinions

　　　C． showing research results

　　　D． asking a question

　　　13．What does the underlined sentence in Paragraph 3 really mean?

　　　A． Those who get up early achieve their goals.

　　　B． Early to bed, early to rise is good for health.

　　　C． "Night owls" can focus longer than "early birds".

　　　D． "Early birds" are as hard-working as "night owls".

　　　14．What did the researchers find in a Belgian study?

　　　A． Late risers become sleepier than early risers.

　　　B． Early risers become as focused as later risers.

　　　C． Late risers can think quickly after being awaken for 10 hours.

　　　D． Early risers can think clearly after being awake for 10 hours.

　　　15．What opinion does the author finally agree to?

　　　A． People should get up early.

　　　B． Whatever time suits you, it's OK.

　　　C． Staying up late is good for health.

　　　D． It's impossible to change one's sleeping habit.

二、七选五

　　　As is often the case, you are trying hard to keep your eyes open in class after a late night doing piles and piles of homework, "16．" You are probably thinking, " This weekend I'll make up for all the sleep I have lost."

　　　17．. Most people think the same way-if you stay in bed longer on Saturdays or Sundays, you will recover your missed sleep during the week.

　　　However, this is not correct.18． Actually, researchers have just discovered that sleeping during the weekend will not do you any good, but rather make you feel more tired on Monday morning.

　　　Our body keeps a clock inside. It tells us when to wake up in the morning and when to feel sleepy at night. But the time on our body clock can be changed once we start taking on different sleeping habits.19．. This may mean on Monday morning we sometimes struggle to get out of bed.

　　　If we decide to get up only 20 minutes or half an hour later, it won't matter. This is because our body clock can accommodate(顺应) a delay of up to an hour, which means that a short lie-in at weekends is unlikely to have any big effect, we needn't worry about it at all.20．,

　　　So, what should we do to balance and make up for all the sleep we've missed? Scientists say that simply eight hours of sleep would do the trick, not any longer.

　　　A．You are not alone.

　　　B．I need more sleep!

　　　C．Sleep is important for everyone.

　　　D．Sleeping is nothing like paying back money.

　　　E.However, if we sleep longer our sleep becomes less efficient.

　　　F.But delays of up to two hours or more can throw our body out of order.

　　　G.This is why staying in bed for longer than usual might confuse our body clock.

三、完形填空

　　　We know children should grow up, knowing the right sense of values. Here is a good example to teach them a good lesson.

One day, a young man who was dressed poorly begged___21___door to door along the street.__22____an old wallet in hand, he was asking for a few coins to buy something to eat. He kept