Read the following passage and mark the letter A. B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
If you have ever been to a busy city, you will have seen technology all around. You will have seen skyscrapers and power plants and apartment buildings. You will have seen all manner of infrastructure. Quite often what makes these things work are things that you can't see hidden things that are under the ground.
In New York, for example, if you looked under the ground, you would find over 78,000 miles of electrical cables beneath the streets. These are crucial. They help drive the devices in the buildings and ensure the infrastructure above the ground works like clockwork.
You would also find 6,000 miles of water lines under New York City. If it weren't for those, people would struggle to survive. Where would they get their water? What would they drink? How would they wash? What would happen to their gardens?
You would also find over 4,000 miles of gas lines, which help people in their cooking and heating and other things.
Additionally, you would find over 4000 miles of wires and pipes, some of which might be used as part of the sewerage system and which helps in the removal of waste. If it weren't for those pipes, the city definitely wouldn't be nice place to live!
And what about the TV cables? You would surely find these under the ground, not to mention transportation networks such as subways and tunnels, which help people move.
When you look around your wonderful city, try to imagine what's below the surface.