A . Choose the correct answer : (0.5pt)
 Mobile phones were invented by Martin Cooper in 1973, who was working for Motorola at the time. His
was the first design that was practical and was truly ‘mobile’ (car phones have previously been invented- but
they could only be used in a car). The first commercially available mobile phone was not sold until six years
later. They first sold in Japan. Mobile phones were not commercially available in the United States until 1983.
19. What is the main topic of the passage ?
A. History of mobile phones B. Martin Cooper was American
C. Motorola is a telephone company D. Car phones are better than mobile phones.
20. The first mobile phone was sold in _____________.
A. 1973 B. 1976 C. 1979 D. 1983
 B. Check the following statements True or False : ( 1pt ) Học sinh ghi rõ True hay False ở phần Answers
21. Martin Cooper was the inventor of mobile phones.
22. Car phones couldn’t be used out of a car.
23. The first mobile phones were sold in the USA .
24. American people couldn’t buy the mobile phones until 1983.