第二节  完形填空

阅读下面短文 ，从短文后所给各题的四个选项 (A .B .C和D )中选出能填人相应空白处的最佳选项 ，并在答题卡上将该项涂黑。

Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone   (36) another. In this way they broke off pieces from one of the stones. These chips of stone were usually  (37)  on one side. People used them for   (38)   meat and skin from dead animals, and   (39)   for making other tools out of wood. Human beings need   (40)   tools BECause they did not have sharp teeth like other meat-eating   (41)   , such as lions and tigers. Tools helped people to get food more   (42)   .

Working with tools also helped to   (43)   human intelligence. The human brain GREw bigger, and
human beings began to invent more and more tools and machines. The stone chip was one of the first tools   (44)   people used, and perhaps   (45)   the most important. Some scientists say that it was the key   46   the success of mankind.

Since 1960 a new kind of tool has appeared. This is the silicon chip( & ft )@a little chip of silicon crystal. It is   (47)    than a fingernail, but it can   (48))    more than a million "bits" of information. It is   (49)   electronic brain.

Every year these chips get cleverer, but   (50)   size gets smaller, and their cost gets   (51)   .
Human beings used   (52)   chips for more than two million years, but human   (53)   changed very little in that time. We have used silicon chips for   (54)   a few years, but life is changing faster every day.
(55)   will life be hke in twenty years?

36. [A] after            [B] to             [C] against           [D] among
37. [A] sharp           [B] hot             [C] strange           [D] weak
38. [A] hitting           [B] cutting          [C] hit               [D] cut
39. [A] not             [B] only            [C] just             [D] also
40. [A] store            [B] find            [C] use              [D] repair
41. [A] animals          [B] persons          [C] tools             [D] people
42. [A] easy            [B] easily          [C] difficult          [D] hard
43. [A] prevent          [B] hard            [C] develop          [D] open
44. [A] that            [B] which          [C] what            [D] as
45. [A] they're          [B] it's            [C] there're          [D] you're
46. [A] of            [B] in            [C] to             [D] on
47. [A] smaller          [B] bigger          [C] newer            [D] softer
48. [A] send            [B] produce         [C] store             [D] destroy
49. [A] an            [B] one           [C] a              [D] the
50. [A] its             [B] our            [C] their            [D] your
51. [A] more            [B] fewer           [C] greater           LD] less
52. [A] stone           [B] silicon         [C] wood            [D] iron
53. [A] body            [B] life             [C] nature           [D] health
54. [A] quite            [B] only            [C] nearly            [D] hardly
55. [A] How          [B] When         [C] What          [D] Why