Multiple MatchingExercise 20 of 70

Up there, in the clear fresh air, it isn't just the stars that are glowing. You can climb a mountain and find at the top of it a bleeping nightmare of hi-tech gadgetry and hardship-avoidance devices. Worried about getting lost? Relax with a handheld GPS unit, featuring a 3D and aerial display, plus an in-compass and…

• Which text mentions why people were willing to suffer outdoors in the past.
• Which text mentions the need to understand certain terminology.