The computer plays an important part in our everyday life. It is one of the great    16    in the world in the    17    century. It works for us not only at home, in the offices, in big shops,    18    at schools. Today it is used    19    many ways. It really    20    the world large wealth (财富) and happiness.

The first computer in the world was    21    Enid. It was built in America in 1946. It was    22    and heavy.    23    it was born, it has been developing very fast. Until now it has gone    24    four periods(时期，阶段)and changed a lot. There’re many kinds of computers. Computers are getting smaller and smaller and computing faster and faster. It becomes more and more    25   .

The computer can do most of the things     26    the people. It can help us to    27    about the real world more quickly, to learn    28    we want to learn and to think    29    ourselves.    30    a student in the twenty-first century, you must work hard at it.

16. A. inventions B. discoveries C. robots          D. inventors

17. A. twenty-first  B. twenties         C. twelfth          D. twentieth

18. A. also         B. but also        C. too             D. either

19. A. in B. to            C. by              D. over

20. A. takes        B. helps            C. gets             D. brings

21. A. found B. invented        C. called           D. bought

22.A. easy B. small           C. large           D. light

23. A. For B. Until           C. When           D. Since

24. A. by B. across          C. through           D. against

25. A. serious B. harmful.        C. dangerous       D. helpful

26. A. for B. to             C. at               D. with

27. A. set B. tell            C. know           D. talk

28. A. what B. that            C. which           D. who

29. A. of B. about          C. out               D. for

30. A. For B. Be            C. As               D. To

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