6.Try this:For a whole day,forget about the clock.Eat when you're hungry and sleep when you're tired.What do you think will happen?
You may be surprised to find that your day is much like most other days.You'll probably get hungry when you normally eat and tired when you normally sleep.Even though you don't know what time it is,your body does.
Inside our bodies are several clocklike systems(系统)that follow a 24-hour cycle(循环).Everyone is unique (唯一的),which is why you might like to stay up late while your sister always wants to go to bed early.
Regularly staying up late can make kids do worse on tests.And working at night leads to higher rates(比率)of heart disease.
"There is a growing sense that when we eat and when we sleep are important parts of how healthy we are,"says Steven Shea,Director of the Sleep Disorders Research Program at Brigham and Women's Hospital in Boston.
"During the night,we are ready to sleep,"Shea says."During the day,we are ready to eat and move around.If you change what you are doing,everything is out of phase.That can have very bad result."

52.According to the passage,if we forget about the clock,we willB.
A.forget the time    B.behave as usual    C.feel hungry     D.eat more food
53.A clocklike systemA.
   A.has a 24-hour cycle                   B.makes everyone unique
   C.makes kids do worse on tests           D.leads to higher rates of heart disease
54.The underlined phrase"out of phase"meansD.
A.外面的         B.有序的         C.无助的     D.不协调的
55.The passage is written mainly to tell usB.
  A.the growing sense is important to our health
B.we should follow clocklike system in our daily life
C.eat when you're hungry and sleep when you're tired
D.the clock like system makes your sister go to bed early.
5.School Subjects
In America,after middle school comes high school.It includes grades 9 through 12.Students are required to take certain subjects like English,social studies,math,science and physical education.In addition,they have elective(选择的) subjects.Electives include subjects in technology,music,art and foreign languages.
School Activities
Each school holds certain yearly activities for the entire school body,such as homecoming,prom night,holiday celebrations,etc.Homecoming is celebrated each fall,usually on a weekend.It usually includes a parade and ends with a football game and school dance.The prom is a formal dance for students in grades 11 and 12.At the prom,students dance,have snacks and drinks,and chat.Besides hosting events for holidays such as the Fourth of July and Halloween,individual high schools often have their own special events.
Part-time Jobs
Many high school students have part-time jobs by the age of 15 or 16,some even earlier.Their first jobs are often babysitting or cutting lawns,but later they will likely get a job at a fast-food restaurant,video store,or clothing shop.
Driving
Sixteen is the legal driving age in most states,and students usually want to own a car as soon as they can.Some parents allow their children to drive a family car,and may even buy a car as a graduation present.

44.Students are asked to takeCas a certain subject.
A.music
B.art
C.science
D.Chinese
45.The first part-time jobs for high school students are oftenB.
A.fast-food restaurant waiters
B.babysitting or cutting lawns
C.working in video stores
D.working in clothing shops
46.The passage tells us thatC.
A.middle school includes Grade 9 through 12 in America
B.on a weekend of each fall,homecoming is celebrated by students
C.if you were 17,it is legal to drive a car in the America
D.the car is too expensive to buy,so the parents won't buy it for their children
47.We can most probably find this passage in a magazine onD.
A.science
B.sports
C.entertainment
D.life.
2.A lot of earthquakes happen in the world every year.Why do earthquakes happen?Scientists tell us the outside of the earth is made of a number of different plates (板块).The plates move very slowly.Sometimes they stop and don't move for a long time.When some of the earth's plates move suddenly,an earthquake happens.
    Many earthquakes happen under the sea.Sometimes they happen near mountains.In fact,earthquakes may happen anywhere on the earth.
    During an earthquake,the shakings make rocks rise suddenly and even break open.Houses fall.People are killed or hurt.Sometimes whole villages or cities are destroyed.
    Can we do something to keep ourselves safe from earthquakes?Scientists have studied earthquakes and made maps that show"earthquake belts".In the areas in these belts,it's possible for earthquakes to happen.In these areas we can make houses strong enough to stand against earthquakes.
    In the future,scientists will be able to predict (预言) exactly when and where an earthquake will happen.They can tell us what to do and how to do it as well.
Judges the flowing sentences true (T) or false (F) according to the passages.
61.Few earthquakes happen in the world every year.F
62.The outside of the earth is made of a number of different plates.T
63.We can do nothing to keep ourselves safe from earthquakes.F
64.A map showing the earthquake belts tells people what kind of houses can stand in an earthquake.
F
65.In the future,scientists can predict exactly when and where an earthquake will happen.T.
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