BSince the beginning of time, man has invented manyinteresting things. Some of these inventions, like the TV setand the radio, have certainly changed history. Since 1946,one of the most important inventions has been the computer.The first computer was built in the middle of the 20thcentury....
In 1969 man took his biggest step away from the earth. American first walked on the moon. This is certainly just a beginning though. New inventions will someday allow us to do things we have never yet dreamed of. 31. What were invented in the first half of the 20th century? A. Hel...
when light was invented C. which country made the first step into space D. how inventions effect people's life(2)Nylon came out nearly at the same time as C A.radio B. camera C. jet planes D. movies(3)Which of the statements is not true? A. The wheel was the first great ...
Bicycles have existed (存在) for over 100 years, and scientists have been discussing about how exactly they work, or more specifically, how they stay upright, almost since they were first invented. But there’s no exact answer to it. And because bicycle dynamics (动态) isn’t exactly an ...
1. The wheel was the great invention that is still very today. 2. The wheel made it easier to carry things and to to a far place. 3. The camera, the light and the radio were invented in the of the 19th century. 4. Nylon came out in , and it changed the kind of . ...
when light was invented C. which country made the first step into space D. how inventions affect people's life( )2. Nylon came out nearly at the same time as A.radio) B. camera C. jet planes D. movies( )3. What does " a desire" mean in the sentence"Man had a desire to ...
D Since the beginning of time, man has invented many interesting things. Some of these inventions, like the number and the radio, have certainly changed history. Since 1946, one of the most important inventions has been the computer.The first computer was built at University of Pennsylvani a...
(1) What were invented in the first half of the 20th century ? ___ A. Helicopters B. Computers C. Movies with sounds D. All above (2) People could live longer lives because ___ worked very well in the 20th century. A. doctors...
In the second half of the 19th century, many great inventions were made. Among them were the camera, the light bulb and the radio. These all play a big part in our daily life today. The first part of the 20th century saw more great inventions. The helicopter was invented in 1907, ...
In1969mantookhisbiggeststepfromtheearth.Americansfirstwalkedonthemoon.Thisiscertainlyjustabeginningthought.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.()61.Thispassagetalksmainlyabout. A. whycarswereveryimportant B. whenlightwasinvented C. whichcountrymadethefirststepintospace D. how...