The key answer of exercise 1
The key to exercise solutions in chapter 7.7 - Use of English for the textbook Focus 4 (2nd edition) - Student's Book with authors Sue Kay, Vaughan Jones and Daniel Brawshaw from Pearson Education
Question
What do you know about GPS? Discuss the questions.
Answer
- Global Positioning System
- Three satellites measure the distance and triangulate your position, a fourth one corrects the position.
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