Force other than damaging winds are also at work inside tornadoes. Sometimes, as the turning, jumping funnel(漏斗) passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion(爆炸) is caused by the low air pressure at the center of a tornado.

The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57,600 pounds. The pressure on the four walls adds up to 172,800 pounds.

If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the great inside pressure may cause the building to burst.

　　Unfortunately, heavy rain happens in thunderstorms that later produce tornadoes. So, people often shut all windows to protect their property. This may cause far worse damage later.

63. Which of the following is the main topic of the passage?

A. Where tornadoes are formed. 　　      B. When tornadoes usually occur.

C. How tornadoes can be prevented.　　     D. Why tornadoes cause so much damage.

64. According to the passage, tornadoes can destroy building because the _____.

A. force of a tornado increases the air pressure in a building

B. air pressure at the center of a tornado is over 172,000 pounds

C. weight of a tornado can crush a building’s roof when it passes overhead

D. air pressure inside a tornado is less than the air pressure inside a building

65. According to the passage, the pressure on a building during a tornado can be reduced　　　　by _____.

A. closing the windows 　　　　　        B. opening the windows

C. using an electric fan 　　　　          D. making the roof and walls stronger

E
　　　Scholars and students have always been great travelers. The official case for “academic mobility” is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the areas of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the best teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold
　　Mobility of this kind meant also mobility of ideas, their moving across borders, their simultaneous  (同时发生的)impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one thinks that only eccentrics have no interest in being credited(相信) with a striking discovery, or a new technique. It must also have been comforting to know that other people in other parts of the world were about to make the same discovery or were thinking along the same lines, and that one was not quite alone, faced by question, ridicule or neglect.
　　In the twentieth century, and particularly in the last 20 years, the old footpaths of the wandering scholars have become vast highways. The vehicle which has made this possible has of course been the aeroplane, making contact between scholars even in the most distant places immediately available, and providing for the very rapid transmission of knowledge.
　　Apart from the vehicle itself, it is fairly easy to identify the main factors which have brought about the recent explosion in academic movement. Some of these are purely quantitative and require no further mention: there are far more centres of learning, and a far greater number of scholars and students.
　　In addition one must recognize the very considerable increase of all kinds of subjects, particularly in the sciences, which by widening the total area of advanced studies has produced an enormous number of specialists whose particular interests are precisely defined. These people would work in some isolation if they were not able to keep in touch with similar isolated groups in other countries.
71.It can be concluded from the passage that"academic mobility"_____.
A.means the friendship formed by scholars on the trip
B.is a program carried out by governments
C.has been put great emphasis on in the world
D.means going abroad in search of the best teachers
72.The word "eccentric" underlined in the second paragraph most probably means_____.
A.a rather strange person                              B.a person of no exceptional ability
C.an ambitious person                                  D.peculiar or unusual
73.In the eyes of the author,what happens to a scholar who shares his ideas with his      
colleagues?
A.He risks his ideas being stolen.                   B.He gains recognition for his achievement
C.He is considered as an eccentric.                 D.He is credited with a striking discovery.
74.According to the passage,the recent growth in air travel has meant that_____.
A.travel around the world becomes realistic and affordable
B.more students from remote areas can attend universities
C.all kinds of information can be shared by more people
D.scholars can meet each other more easily
75.The author thinks that it's important for scholars to be able to travel because_____.
A.their laboratories are in remote places
B.there is too much stress at universities
C.their fellow experts are spread across the world
D.there are so many people working in similar fields

A high school history teacher once told us, “If you make one close friend in school, you will be most fortunate. A true friend is someone who stays with you for life."_26_ teaches that he was right. Good friendship is just not easily _27_.

It is possible that we simply do not stay in one place long enough for_28_friendship to _29_. However, there can be_30_disagreement on the need for each of us to think carefully about the kind of friendship we want.

To most of us, friendships are considered very important, but we need to have it clear in our _31_ what kinds of friendship we want. Are they to be close or _32_ at arm's length? Do we want to _33_ourselves or do we want to walk on the surface? For some people, many friendships on the surface are _34_enough—and that' s all right. But at some point we need to 35 that our expectations are the same as our friends' expectations. The sharing of_36_experience _37_ our tears as well as our dark dreams is the surest way to deepen friendships. But it _38_be undertaken(进行) slowly and carried on only if there are _39_of interest and action in return.

　　What are some of the _40_of friendship? The greatest is the attraction to expect too much too soon. Deep relationships _41_time. Another “major difficulty" is the selfishness to think one “possesses" the other, including his time and attention. Similarly, friendships _42_ actions in return. In 43 words, you must give as much as you take. Finally there is a question of taking care of. Unless you spend _44_time together, talking on the phone, writing letters, doing things together, friendships will die _45_?.

1.                A．Knowledge      B．Teachers        C．Experience    D．Parents

2.                A．understood     B．formed         C．realized  D．produced

3.                A．true           B．common        C．deeply   D．actual

4.                A．design          B．intend          C．develop  D．appear

5.                A．no             B．some           C．any  D．none

6.                A．hearts          B．thoughts        C．actions   D．minds

7.                A．remained       B．left            C．kept D．stayed

8.                A．own           B．owe            C．Share    D．spare

9.                A．that            B．very           C．quite     D．not

10.               A．make sure      B．remember      C．expect    D．check out

11.               A．social          B．ordinary        C．good D．personal

12.               A．includes        B．to include       C．including D．included

13.               A．can            B．need           C．will   D．must

14.               A．marks          B．sights          C．sence D．signs

15.               A．difficulties      B．differences      C．advantages     D．things

16.               A．cost           B．spend          C．ask   D．take

17.               A．require         B．request        C．depend   D．suggest

18.               A．some          B．many          C．other     D．different

19.               A．reasonable      B．comfortable     C．less   D．a lot

20.               A．for            B．away           C．out   D．from

The history of nomenclature (命名) in Britain is so old that no one knows the beginning of the story. Since written history began， people have had names. It is therefore impossible to do more than guess at how the earliest given names were chosen. Most names appear to have had some sort of original meaning， usually descriptive， rather than being simply a pleasing collection of sounds.

These descriptive names developed both from nouns and adjectives. The Irish Gaelic people  used descriptive nouns and adjectives which were meaningful. Early in prehistory some descriptive names began to be used again and again until they formed a name pool for that particular culture. Parents would choose names from the pool of existing names rather than invent new ones for their children.

With the rise of Christianity (基督教)， Christians were encouraged to name their children after the holy people of the church. These early Christian names can be found in many cultures today， in various forms. The pool of names in use in England changed basically after the Norman came in 1066. Then French names of Germanic origin became popular within three generations. As a result names like Emma， Matilda， Richard， and William， became common in English nomenclature. At the same time a few Old English names， like Edward and Alfred remained because they were names of holy people or kings； others were kept because they were used with slight changes by Germanic names from the Normans like Robert.

Surnames developed from bynames， which are additional ones used to differentiate people with the same given name.  These bynames fall into particular patterns.  These started out as specific  to a person and were taken down from father to son between the twelfth and sixteenth century. The noble usually used taken-down surnames early or the peasants did so later.

1.We can infer from the text that　　　　.

A.the first given names had not any actual meanings

B.people probably had names when there was no written language

C.the history of nomenclature is shorter than written history

D.names began to be used long after there was written language

2. The underlined word “they” (in Para.3) refers to “　　　　”.

A.Old English names               B.other names

C.names of Germanic origin  D.names of holy people

3.According to the text， which of the following statements is TRUE？

A.Robert is a Germanic name from the Normans.

B.Church didn’t encourage nomenclature used in the church.

C.Names like Emma and William were the most popular in 1066.

D.Names like Edward and Alfred were French names of Germanic origin.

4. Give the right order of surname development in history.

(a)People used bynames to differ people with the same given names.

(b)People chose given names from the pool of existing names.

(c)Bynames started out as specific to a person.

(d)Surnames became popular with common people.

(e)Surnames were taken down from father to son in noble families.

A.b-a-e-c-d          B.a-b-c-d-e   C.a-b-c-e-d         D.b-a-c-e-d

5. Which group of words can best describe the development of British nomenclature？

A.Additional， Particular and Various

B.Meaningful， Christian and Foreign

C.Descriptive， Meaningful and Germanic

D.Old English-styled， Christian and Original