Number　 sense is not the ability to count. It is the ability to recognize a 　 1　 in number. Human beings are born with this ability. 2 ，experiments show that many animals are, too. For example, many birds have good number sense. If a nest has four eggs and you remove one, the bird will not　 3 . However, if you remove two, the bird 4 leaves. This means that the bird knows the 　5　 between two and three.

Another interesting experiment showed a bird's 6 number sense. A man was trying to take a photo of a crow(乌鸦)that had a nest in a tower, but the crow always left when she saw him coming. The bird did not 7 until the man left the tower. The man had an 8 .He took another man with him to the tower. One man left and the other stayed, but they did not 9 the bird. The crow stayed away until the second man left, too. The experiment was　 10 with three men and then with four men. But the crow did not return to the nest until all the men were 11 .It was not until five men went into the tower and only four left that they were 12 able to fool the crow.

How good is a human's number sense? It's not very good. For example, babies about fourteen months old almost always notice if something is taken away from a 　13 group. But when the number goes beyond three or four, the children are 14　 fooled.

It seems that number sense is something we have in common with many animals in this world, and that our human 15 is not much better than a crow's.

1. A. rise　　　　　　　 B. pattern　　　　　　　　　　　　　 C. change　　　　　　　　　　 D. trend

2. A. Importantly　 B. Surprisingly　 C. Disappointedly D. Fortunately

3. A. survive　　　　　　　　 B. care　　　　　　　　 C. hatch　　　　 D. notice

4. A. generally 　　　　　　 B. sincerely　　 C. casually　　　　　 D. deliberately

5．A. distance 　　　　　 B. range　　　　 C. different　 　　　 D. interval

6．A. amazing 　　　　　 B. annoying　　　　　 C. satisfying　 D. disturbing

7. A. relax　　　　　　　　　 B. recover　　　　　　 C. react　　　　 D. return

8. A. appointment　　　　 B. excuse　　　　　　 C. idea　　　　　 D. explanation

9. A. fool　　　　　　　　　　 B. hurt　　　　　 C. catch　　　　 D. kill

10.A. repo　　　　　　　　　　　　　 B. repeated　　 C. designed　　 D. approved

11.A. confused　　　　　　 B. gone　　　　 C. tired　　　　　 D. drunk

12.A. gradually　　　　　　 B. luckily　　　 C. strangely　 D. finally

13.　 A. single　　　　　　　 B. small　　　　 C. local　　　　 D. new

14. A. seldom　　　　　　　 B. temporarily C. merely　　　 D. often

15. A. sight　　　　　　　　　 B. nature　　　 C. ability　　　　 D. belief

A punctual person is in the habit of doing a thing at the proper time and is never late in keeping an appointment.

　   The unpunctual man，on the one hand，never does what he has to do at the proper time._ 1._There is a proverb saying, “Time flies never to be recalled”. This is true. __2.__Time is more valuable than material things. In fact，time is life itself. The unpunctual man is for ever wasting and mismanaging his most valuable possessions as well as other's. The unpunctual person is always complaining that he finds no time to answer letters，or return calls or keep appointments promptly.. __3.__He knows that he can not get through his huge amount of work unless he faithfully keeps every piece of work when it has to be attended to. __4.__If a person is invited to dinner and arrives later than the appointed time，he keeps all the other guests waiting for him. Usually this will be regarded as a great disrespect to the host and all other guests present.

　   Unpunctuality，moreover，is very harmful when it comes to do one's duty，whether public or private. Imagine how it would be if those who are put in charge of important tasks failed to be at their proper place at the appointed time.__ 5.__

A. He is always in a hurry and in the end loses both time and his good name

B. They appear to be busy but never get well organized

C. Maybe everybody minds being kept waiting at a party

D. A lost thing may be found again，but lost time can never be regained.

E. But the man who really has a great deal to do is very careful of his time and seldom complains of want of it

F. After all, man who is known to be habitually unpunctual is never trusted by his friends or fellow men.

G. Failure to be punctual in keeping one's appointments is sign of disrespect towards others.

A punctual person is in the habit of doing a thing at the proper time and is never late in keeping an appointment.

A punctual person is in the habit of doing a thing at the proper time and is never late in keeping an appointment.

　 The unpunctual man, on the other hand, never does what he has to do at the proper time. He is always in a hurry and in the end loses both time and his good name. A lost thing may be found again, but lost time can never be regained. Time is more valuable than material things. In fact, time is life itself. The unpunctual man is forever wasting and mismanaging his most valuable asset(财产)as well as others’. The unpunctual person is always complaining that he finds no time to answer letters, or return calls or keep appointments promptly. But the man who really has a great deal to do is very careful of his time and seldom complains of want of it. He knows that he cannot get through his huge amount of work unless he faithfully keeps every piece of work when it has to be attended to.

　 Failure to be punctual in keeping one’s appointments is a sign of disrespect towards others. If a person is invited to dinner and arrives later than the appointed time, he keeps all the other guests waiting for him. Usually this will be regarded as a great disrespect to the host and all other guests present.

　 Unpunctuality, moreover, is very harmful when it comes to do one’s duty, whether public or private. Imagine how it would be if those who are put in chare of important tasks failed to be at their proper places at the appointed time. A man who is known to be habitually unpunctual is never trusted by his friends or fellow men.

1. What does the author think is the main difference between a punctual person and an unpunctual person?

　 A. A punctual person does everything ahead of time while an unpunctual person does

everything behind schedule.

　 B. A punctual person does everything at the right time while an unpunctual person seldom

does anything at the correct time.

　 C. A punctual person has a lot of appointments while an unpunctual person has few

appointments.

　 D. A punctual person has much time to do everything while an unpunctual person has little

time to do anything.

2. According to the passage, the main reason that a person is always unpunctual is that____.

　 A. he has more work to do than other people

　 B. he is always in a hurry when he works

　 C. he doesn’t care much about time

　 D. he always mismanages and wastes his time

3. According to the third paragraph, when you are invited to dinner, you should arrive there____.

　 A. after other guests have arrived

　 B. before all other guests

　 C. at the appointed time

　 D. after the host has got things ready

4. Which of the following statements best describes the harm of unpunctuality?

　 A. If you are an unpunctual person, you cannot be in charge of any important task.

　 B. If your friends know that you are unpunctual, they may not see you again.

　 C. Unpunctuality may bring about heavy losses for both public and private affairs.

　 D. Unpunctuality may make you miss a lot of appointments and lose friends.

— I reminded you not to forget the appointment.?

—　　　　 .?

A.So you did　　　　　　 B.So I do not?　　　　 C.So did you　　　　 D.So do I