So far, people have invented so many things that changed our life. The first great36 was one that is still very 37 today-the wheel. This made it easier for us to carry heavy things and 38 long distances.
For hundreds of years after that, there were 39 inventions that had as much effect as the wheel. Then in the early 1800s the world started 40 . There was little unknown land in the world. People did not have to explore much any more. They began to work in order to make life better.
During the second half of the 19th century many great inventions 41 . Among them were the electric light and the radio. These 42 became a big part of our life today.
The first part of the 20th century. saw 43 great inventions: the helicopter(直升机) in 1903, movies with sound in 1927, and jet planes in 1937. This was 44 a time when a new material was first made. Nylon came out in 1935. It changed the kind of clothes people had been 45 .
36. A. invention B. food C. inventor D. animal
37. A. useless B. impassive C. important D. comfortable
38. A. sail B. fly C. move D. travel
39. A. little B. a little C. few D. a few
40. A. to change B. to changing C. changed D. change
41. A. are made B. can be made C. has been made D. were made
42. A. both B. all C. whole D. thing
43. A. much B. more C. less D. most
44. A. also B. too C. either D. as well
45. A. wearing B. putting on C. worn D. put on
