We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.

A. which; when          B. when; which      C. what; that         D. on which; when

 

We can never expect____ bluer sky unless we create_____less polluted world.

A. a; a                                   B. a; the

C. the; a                                 D. the; the

Early one morning,more than a hundred years ago,an American inventor called Elias Howe finally fell asleep.He had been working all night on the design of a sewing machine but he had run into a very difficult problem: It seemed impossible to get the thread to run smoothly around the needle.

Though he was tired,Howe slept badly.He turned and turned.Then he had a dream.He dreamt that he had been caught by terrible savages whose king wanted to kill him and eat him unless he could build a perfect sewing machine.When he tried to do so,Howe ran into the same problem as before.The thread kept getting caught around the needle.The king flew into the cage and ordered his soldiers to kill Howe.They came up towards him with their spears raised.But suddenly the inventor noticed something.There was a hole in the tip of each spear.The inventor awoke from the dream,realizing that he had just found the answer to the problem.Instead of trying to get the thread to run around the needle,he should make it run through a small hole in the center of the needle.This was the simple idea that finally made Howe design and build the first really practical sewing machine.

Elias Howe was not the only one in finding the answer to his problem in this way.Thomas Edison,the inventor of the electric light,said his best ideas came into him in dreams.So did the great physicist Albert Einstein.Charlotte Bronte also drew in her dreams in writing ?Jane Eyre.?

To know the value of dreams,you have to understand what happens when you are asleep.Even then,a part of your mind is still working.This unconscious(无意识的),but still active part understands your experiences and goes to work on the problems you have had during the day.It stores all sorts of information that you may have forgotten or never have really noticed.It is only when you fall asleep that this part of the brain can send messages to the part you use when you are awake.However,the unconscious part acts in a special way.It uses strange images which the conscious part may not understand at first.This is why dreams are sometimes called “secret messages to ourselves ”.

According to the passage,Elias Howe was_________.

A.the first person we know of who solved problems in his sleep

B.much more hard-working than other inventors

C.the first person to design a sewing machine that really worked

D.the only person at the time who knew the value of dreams

The problem Howe was trying to solve was_________.

A.what kind of thread to use

B.how to design a needle which would not break

C.where to put the needle

D.how to prevent the thread from getting caught around the needle

Thomas Edison is spoken of because_________.

A.he also tried to invent a sewing machine

B.he got some of his ideas from dreams

C.he was one of Howe's best friends

D.he also had difficulty in falling asleep

Dreams are sometimes called “secret messages to ourselves” because _________.

A.strange images are used to communicate ideas

B.images which have no meaning are used

C.we can never understand the real meaning

D.only specially trained people can understand them

The skin which covers the tips of the fingers and thumbs is crossed by numerous ridges (隆起) arranged in different patterns. These patterns are permanent from birth and remain exactly the same throughout a person's life, even when the skin becomes wrinkled and cracked as a result of old age. Such patterns are never passed on from parents to children, and no one in the world has the same patterns as anyone else. Even identical twins have different sets of fingerprints. As a result, fingerprints offer a most useful and foolproof way of identifying people. Any ridged part of the hand and the foot may be used as a means of identification, but finger impressions are usually preferred since they can be taken easily and quickly.
Fingerprints are classified in the ways: by general shapes and contours(轮廓), by the finger positions of the pattern-types, and by size (often measured by counting the ridges in the loops). Every set of fingerprints has different “ridge characteristics” (i. e. the print of each separate finger is different from that of all the other fingers), which belong to one of four basic groups: arches, loops, whorls and composites. All fingerprints can then be divided into 1, 024 groups. By using details in the patterns above, these 1, 024 groups can be further divided into thousands of smaller groups, thus making it possible to find a particular set of fingerprints in a few minutes.
【小题1】According to this passage, the true statement about human fingerprints is that ____.

A．people's fingerprints sometimes can be passed on from parents to children

B．people’s fingerprints are unique but identical twins may have the same fingerprints

C．using fingerprints is the only way to identify people

D．people's fingerprints will not change in all their lives

【小题2】We prefer to use fingerprints to identify people because ____.

A．we can never find the same set of fingerprints among human beings

B．finger impressions can be taken easily and quickly

C．fingerprints offer a most useful and foolproof way of identifying people

D．all of the above

【小题3】The word “foolproof” (Line 7, Para. 1) most probably means ____.

A．that is permanent	B．that is acceptable
C．that can not go wrong	D．that is not foolish

【小题4】About the classification of fingerprints, which is TRUE? ____.

A．Fingerprints can be classified in three ways

B．All fingerprints can be divided into 1, 024 groups and can not be divided further

C．It is not easy to find a particular set of fingerprints in a short time

D．People can not classify the fingerprints in an effective way

We can never expect         bluer sky unless we create         less polluted world.

   A. a; a       B. a; the          C. the; a         D. the; the