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Read the passage carefully and choose the correct answer.
At the beginning of TV history, there were several types of TV technology. One system was a mechanical model based on a rotating disc. (Rotating discs are discs that spin like CDs.) The other system was an electronic model. In 1906, Boris Rosing built the first working mechanical TV in Russia. In the 1920s, John Logie Baird in England and Charles Francis Jenkins in the United States demonstrated improved mechanical systems. Philo Taylor Farnsworth also showed an electronic system in San Francisco in 1927. His TV was the forerunner of today's TV, which is an electronic system based on his ideas.
Now TV is everywhere. Before 1947, there were only a few thousand televisions in the U.S. By the 1990s, there were televisions in 98% of American homes.
Câu hỏi:Rotating means ____________
- A. going up and down.
- B. going back and forth.
- C. spinning.
- D. staying still
Lời giải tham khảo:
Đáp án đúng: C
Kiến thức: Đọc - hiểu
Giải thích:
Rotating nghĩa là ________
A. đi lên và đi xuống.
B. di chuyển tiến và lùi
C. quay
D. đứng yên
Thông tin: Rotating discs are discs that spin like CDs
(Đĩa rotating là đĩa quay giống như đĩa CD)
Chọn C
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