We live in the“computer age.”Just 42 years __(1)__ computers couldn't do much. They were very big and expensive. They used a lot of energy（能量）. Only __(2)__ people were interested __(3)__ them. Today computers are smaller and cheaper. They can do __(4)__ difficult work.

　　Computers become important __(5)__ many reasons. They work faster than man and make fewer mistakes. They can“remember”much information. A computer can do millions of problems __(6)__ a few seconds. A person might __(7)__ years to work out so many problems.　　People now use computers in nearly every kind of work. Computers are very useful and the use of computers __(8)__ growing. More computers mean more job for people, because people __(9)__ to run（操作）and mend them.

What do you think are the most important inventions of the past 2,000 years? The TV? The printing? The telephone? Or the computer? A report shows that these are not the only important inventions. Here are four other important ones.

Paper is one of the most important inventions. You can’t have printing without paper. In 105 AD, Cai Lun invented paper in China. Long before the printing and Internet, Cai Lun’s invention allowed us to write down information, stories and history.

One of the simplest (最简单) inventions to save life is the toilet. Before toilets, waste ran into the rivers from people’s houses. Illnesses were common (普通的) in big cities, and it was often difficult to find clean drinking water.

Animal food is another invention. Before the invention, most animals were killed every autumn because there was not enough food for them in the winter. After hay (干草) became a kind of common animal food, animals could live through the long winter.

Reading glasses is the fourth invention. People start getting far-sighted (远视) from the age of 45. Glasses mean that anyone can read, write and do “close work” after that age. Without glasses, the world would be difficult for the people above 45.

1.Cai Lun’s invention of paper makes it possible to ______.

A．have printing                           B．feed animals

C．drink clean water                       D．do “close work”

2.The invention of the toilet can stop people from ______.

A．saving water                           B．getting ill

C．living in big cities                        D．finding clean water

3.Why couldn’t the animals live through the winter?

A．It was very cold in winter.                 B．They didn’t have enough food to eat.

C．They had no drinking water.               D．They died of illness.

4.From the last paragraph we learn that ______.

A．all people need reading glasses

B．anyone must do “close work” after 45

C．reading glasses are useful

D．life is more difficult for the people under 45

What do you think are the most important inventions of the past 2,000 years? The TV? The printing? The telephone? Or the computer? A report shows that these are not the only important inventions. Here are four other important ones.

Paper is one of the most important inventions. You can’t have printing without paper. In 105 AD, Cai Lun invented paper in China. Long before the printing and Internet, Cai Lun’s invention allowed us to write down information, stories and history.

One of the simplest (最简单) inventions to save life is the toilet. Before toilets, waste ran into the rivers from people’s houses. Illnesses were common (普通的) in big cities, and it was often difficult to find clean drinking water.

Animal food is another invention. Before the invention, most animals were killed every autumn because there was not enough food for them in the winter. After hay (干草) became a kind of common animal food, animals could live through the long winter.

Reading glasses is the fourth invention. People start getting far-sighted (远视) from the age of 45. Glasses mean that anyone can read, write and do “close work” after that age. Without glasses, the world would be difficult for the people above 45.

47. Cai Lun’s invention of paper makes it possible to ______.

   A. have printing         B. feed animals    

   C. drink clean water      D. do “close work”

48. The invention of the toilet can stop people from ______.

   A. saving water               B. getting ill 

   C. living in big cities      D. finding clean water

49. Why couldn’t the animals live through the winter?

  A. It was very cold in winter.   B. They didn’t have enough food to eat.

  C. They had no drinking water. D. They died of illness.

50. From the last paragraph we learn that ______.

   A. all people need reading glasses     

   B. anyone must do “close work” after 45

   C. reading glasses are useful   

   D. life is more difficult for the people under 45