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Now a lot of people like to keep dogs as their pets．But do you know dogs were wild(野生的)animals long，long ago?

    The  1  wild dogs were trained by   2   in Europe about 10，000 years ago．These first“dogs”were not like  3  we have now．They may have been small wolves．These dogs often came near humans to  4  some food．Some of the young dogs were adopted(收養(yǎng))by people and grew-up with them．

Humans believed the  5  were a help to them in many ways．The dogs helped them to hunt(狩獵)．They could smell and hear danger  6  people could．They helped to keep people    7  on cold night．So it was  8  to raise the dogs.

Now，there are many different kinds of dogs  9  they may look quite different from each other．Dog trainers think there are more than 400 different kinds in the world．The number keeps increasing with new kinds．

    Since those early days，humans and dogs have always been together，We should   10   them from now on because they are really our friends．

   1．A．whole     B，late       C．1ast      D．first

   2．A．wolves    B．eats       C．humans   D．students

   3．A．where     B．what      C．when     D．which

   4．A．serve      B．waste     C．make     D．steal

   5．A．cats       B．foxes      C．wolves   D．dogs

   6．A．when      B．a(chǎn)fter      C．before    D．a(chǎn)s soon as

   7．A．cool       B．warm     C．hot       D．cold

   8．A．useful      B．useless    C．easy     D．hard

   9．A．so         B．a(chǎn)nd       C．but      D．a(chǎn)lthough

   10．A．protect      B．kill       C．hurt     D．see

    We have always been interested in the moon．2000 years ago people a1ready knew it moved around the earth and where it would be in the sky at different times of the year．At that time，everything about the moon was learned by watching it carefully in the sky．

    When scientists could use telescopes(望遠鏡)to study the moon more closely，their ideas began to change．They could see the moon was made of rocks．Most scientists thought moon rocks would be different from those on Earth．This was because they believed the moon had once been a planet(行星)that had been caught in the earth’s gravity(引力)millions of years earlier

    In 1969 moon rocks were finally brought to the earth and studied．Much to their surprise，scientists found that，except for water，the moon and the earth were made of the same thing．Once again new ideas were needed for this new information．

    After years of study，most scientists now think that the moon was once part of Earth．They believe very early in its history，maybe 4 million years ago，something about the size of Mars(火星)hit Earth．This sent billions of rocks into space around our planet．These rocks slowly joined together and after many years became the moon．

    In the future，even though our ideas about the moon may change again，we will still be interested in it．

1．Now，we’re sure       

    A．Moon rocks are quite different from those on Earth．

    B．Moon was once a part of Earth．

    C．Moon moves around Earth and it's the only satellite of Earth．

D．Moon was once a planet caught in Earth’s gravity．

2．In 1969 there is a big event，that is       ．

    A．humans found no water in Moon rocks

    B．scientists made out a modern spaceship

    C．scientists invented an advanced telescope

D，humans left their footprints on Moon

3．What does the writer want to tell us in the passage?

    A．Why people are interested in the moon．

    B．How ideas about the moon have changed over time．

    C．Where the moon came from in the past．

    D．That people have finally learned the truth about the moon．

4．Before l 969 most scientists thought the moon was        ．

    A．part of the earth billions of years earlier

    B．older than the earth

    C．a(chǎn) planet caught by the earth’s gravity

    D．made of the same things as the earth

5．From this passage we can learn that          ．

    A．scientists in the past were not clever

    B．the earth was once part of the moon

    C．new information brings new ideas

    D．we now know everything about the moon

The brain is the boss of the body．Your eyes, ears, nose, and skin tell your brain what is going on around you．Other parts of your body tell your brain what is going on inside of you．Your brain takes in the signals．It tells your body what to do with them．When you touch fire, your skin tells your brain that your finger is too hot．Your brain tells you to move your finger．All these happen very fast．Your brain also controls your breathing, blinking （眨眼), and heartbeat．It controls your feelings and thoughts too．

Humans have the most developed brain of all animals．Yet it is not the largest brain．The human brain weighs three pounds．The brain of an elephant weighs 11 pounds．So the largest brain is not always the best brain．In people, a larger brain does not mean a clever person．

1．What is the main idea of this story?

A．The human brain works very fast．       B．The largest brain is not always the best brain．

C．The brain controls the body．                 D．The best brain is the largest brain．

2．What happens after the brain takes in the signals from the body?

A．The brain grows faster and larger．        B．The brain tells the body what to do．

C．The body becomes more developed．            D．We don't know．

3．What does“the boss of the body”mean?

A．The signals．                                         B．The most developed body part．

C．The main part of the body                    D．The control centre of the body．

4．Which brain is the most developed?

A．The largest brain．B．The human brain．C．The smaller brain．D．Not too big brain．

5．What are the things that the human brain does?

A．Takes in signals．                                   B．Controls breathing．

C．Controls feelings and thoughts．                  D．A, B and C．