For well over a thousand years, smallpox was a disease that everyone feared. The disease killed much of the native population in South America when the Spanish arrived there in the early sixteenth century. By the end of the eighteenth century, smallpox was responsible for about one in ten deaths around the world. Those who survived the disease were left with ugly scars on their skin.
It had long been well known among farmers that people who worked with cows seldom caught smallpox; instead, they often caught a similar but much milder disease called cowpox (牛痘) . A British doctor called Jenner was extremely interested in this, and so he studied cowpox. He believed that, by vaccinating (给接种疫苗) people with the disease, he could protect them against the much worse disease smallpox. In 1796, he vaccinated a boy with cowpox and, two months later, with smallpox. The boy did not get smallpox. In the next two years, Jenner vaccinated several children in the same way, and none of them got the disease．
News of the success of Jenner’s work soon spread. Vaccination soon became a common method to protect people against other diseases caused by virus, such as rabies (狂犬病), and vaccines were sent across the world to the United States and India.
It took nearly two centuries to achieve Jenner’s dream of getting free of smallpox from the whole world. In 1967, the world Health Organization (WHO) started a great vaccination program, and the last known case of smallpox was recorded in Somalia in 1977. The story of vaccinations does not end there, however. There are many other diseases that kill more and more people every year. Besides, many new diseases are being discovered. The challenge for medical researchers will, therefore, probably continue for several more centuries
【小题1】Smallpox was so serious that _________________ by the end of l8th century

No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep，and when he awakes，the operation is finished. But these happy conditions are fairly new．It is not many years since a man who had to have operation felt all its pain．

   Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down(压制，控制) on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．

   Soon after 1770, Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it．Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．

   Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．

   As he didn't know enough about laughing gas，he gave a man less gas than he should have. The man cried out with pain when his tooth was being pulled out．

   Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．

It is ＿＿＿＿ since a man being operated felt all the pain．

   A. a few more years   B. not long    C. few years     D. two thousand years

Long ago，when the sick man was operated on, he ＿＿＿＿．

   A. could feel nothing           B. could not want anything

   C. could feel all the pain        D. could do anything

Using the laughing gas，the people did not seem to ＿＿＿＿．

   A. be afraid of anything    B. feel pain   C. want to go to the parties    D. be ill

If a man took less laughing gas than he should have when an operation went on，he ＿．

   A．felt nothing  B. felt very comfortable  C．still felt pain      D．would die

One who took too much of the laughing gas ＿＿＿．

   A.would laugh all the time       B.would die 

C.would never feel pain         D.would be very calm

    No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep， and when he awakes， the operation is finished． But these happy conditions are fairly new． It is not many years since a man who had to have operation felt all its pain．
Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．
Soon after 1770， Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it． Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．
Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．
As he didn't know enough about laughing gas， he gave a man less gas than he should have． The man cried out with pain when his tooth was being pulled out．
Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．
56.It is ___________since a man being operated felt all the pain.
A.a few more years      B.not long         C.few years         D.two thousand years
57. Long ago, when the sick man was operated on, he___________.
A.could feel nothing                     B.could not want anything
C.could feel all the pain              D.could do anything
58.Using the laughing gas, the people did not seem to___________.
A.be afraid of anything       B.feel pain   C.want to go to the parties    D.be ill
59.If a man took less laughing gas than he should have when an operation went on he___________.
A.felt nothing       B.felt very comfortable     C.still felt pain          D.would die

No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep，and when he awakes，the operation is finished. But these happy conditions are fairly new．It is not many years since a man who had to have operation felt all its pain．

   Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down(压制，控制) on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．

   Soon after 1770, Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it．Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．

   Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．

   As he didn't know enough about laughing gas，he gave a man less gas than he should have. The man cried out with pain when his tooth was being pulled out．

   Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．

1.It is ＿＿＿＿ since a man being operated felt all the pain．

   A. a few more years   B. not long    C. few years     D. two thousand years

2.Long ago，when the sick man was operated on, he ＿＿＿＿．

   A. could feel nothing           B. could not want anything

   C. could feel all the pain        D. could do anything

3.Using the laughing gas，the people did not seem to ＿＿＿＿．

   A. be afraid of anything    B. feel pain   C. want to go to the parties    D. be ill

4.If a man took less laughing gas than he should have when an operation went on，he ＿．

   A．felt nothing  B. felt very comfortable  C．still felt pain      D．would die

5. One who took too much of the laughing gas ＿＿＿．

   A.would laugh all the time       B.would die 

C.would never feel pain         D.would be very calm

    No one is glad to hear that his body has to be cut open by a surgeon（外科医生） and part of it taken out． Today， however， we needn't worry about feeling pain during the operation． The sick person falls into a kind of sleep， and when he awakes， the operation is finished． But these happy conditions are fairly new． It is not many years since a man who had to have operation felt all its pain．

Long ago， operation had usually to be done while the sick man could feel everything． The sick man had to be held down on a table by force while the doctors did their best for him． He could feel all the pain if his leg or arm was being cut off， and his fearful cries filled the room and the hearts of those who watched．

Soon after 1770， Josept Priestley discovered a gas which is now called “laughing gas”．Laughing gas became known in America．Young men and women went to parties to try it． Most of them spent their time laughing，but one man at a party，Horace Wells，noticed that people didn't seem to feel pain when they were using this gas．He decided to make an experiment on himself．He asked a friend to help him．

Wells took some of the gas，and his friend pulled out one of Well’s teeth．Wells felt no pain at all．

As he didn't know enough about laughing gas， he gave a man less gas than he should have． The man cried out with pain when his tooth was being pulled out．

Wells tried again，but this time he gave too much of the gas，and the man died．Wells never forgot this terrible event．

1.It is ___________since a man being operated felt all the pain.

A.a few more years        B.not long     C.few years     D.two thousand years

2.Long ago, when the sick man was operated on, he___________.

   A.could feel nothing                 B.could not want anything

C.could feel all the pain                D.could do anything

3.Using the laughing gas, the people did not seem to___________.

A.be afraid of anything      B.feel pain     C.want to go to the parties    D.be ill

4.If a man took less laughing gas than he should have when an operation went on he___________.

A.felt nothing       B.felt very comfortable    C.still felt pain            D.would die