根据短文内容，选择正确答案。

     Since the beginning of time, man has invented many interesting things. Some of these inventions, like

numbers and the radio, have certainly changed history. Since 1946. one of the most important inventions

has been the computer.  It will change all our lives.

     The first computer was built at Harvard University in 1944. It was as large as a room and quite difficult

and slow to operate.  But since the invention of the silicon chip (硅片), computers have become smaller,

easier to use, and faster to operate. Some computers are as small as television sets.  Some computers can

be made smaller than a book.  And computers are getting smaller and all the time.

     There are several reasons why computer is useful. First it can store very. Very large amount of

information. Second, the computer can operate very quickly. Third, modern computer can be built into

other kind of machines, like radio, cars and planes. They can do a lot of work for us.

     Soon, almost everyone. either at home or at work, will use some kind of computers.  The lives of all

of us will be changed by this invention.

1. What have changed history and people's life according to the passage?

A. Numbers.

B. Radios.

C. Computers.

2. The first computer was built ______.

A. in the middle of the 19th century

B. in the middle of the 20th century

C. at the beginning of time

3. A modern computer can be made _____.

A. as large as a room

B. smaller than a book

C. smaller than silicon chips

4. The computer has been made much better since the invention of _____.

A. the silicon chip

B. the radio

C. the color TV set

5. The computer is useful because _____.

A. it can. operate very quickly and can be built into other machines

B. it can store lots of information

C．both A and B